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I think this is a pretty good kit overall, but with big flaws.The Z rod was straighter than the one that came with my Ender 3 Pro and has less defects. So ++ there. I used it on the primary stepper side instead of the original. The opposite side brackets were a bit difficult to install until I figured out I had to un-bolt the X-axis rail to get to a single screw that replaces the bolt to the inside V-groove wheel and eccentric nut. I recommend you use zip ties or soft ties to hold up your X axis while you do this. Take the original bolt out thru the hole in the 20x20 and just pry it out, then insert the longer one. Not difficult, but there's no instructions, so you have to figure this out yourself.Also, this is technically a problem with the original Ender 3/Pro stepper motor mount, but the black plastic mount is tapered and won't allow the stepper to sit flat. You can download a replacement on Thingiverse and print it in PETG or ABS beforehand. Otherwise your Z-rod will be tilted quite severely as height increases. It can work, but you have to leave the screws loose on the new stepper. Not good. Print a new mount part.Also I recommend the CR-10 "stepper hold down" parts as well. You'll require additional hardware, but it keeps your stepper motors flat on the 40x40 extrusions.After that just make sure your Z-rod is centered on the vertical extrusions each side. Mine was offset 16mm exactly each side. This means the new guides you bolt on the top most 20x20 extrusion will be slightly offset. You must remove the plastic cap on the end of the 20x20 extrusions to make it perfectly centered. Measure with a caliper if unsure. I had a small problem with my filament guide and had to print a modified version, but otherwise removing the default plastic cap on the top extrusion wasn't a deal breaker.I wired the stepper to my Z2 input on a BTT SKR Mini E3 V2; but it's just as easy to use the splitter cable. Your motors will run in sync with each other; so make sure the rail is level beforehand. There are multiple dual Z aligner models on Thingiverse. Or use a 1-2-3 block or such. Your X-axis just has to be the same side to side. I also kept the stepper voltage the same (650ma). No issues.I recommend you combine this upgrade with anti-backlash nuts. It'll maintain your Z1, Z2 alignment and keep the X carriage from dropping... ever. Super good prints now and I can use Z-hop with perfect repeatability and no wear.IT took about hour to install this on Creality Ender 3 V2, directions almost non existent. Put hardware in do not need the bearings on Ender3 v2 they do not even match the tower frame width on ender 3v2, hooked motor to frame and the screw thread and installed the new spacer plate for wheels, figured all I need once together is to hook motors up on ender 3v2 with supplied Y cable......The supplied Y cable figured out must be connected to motherboard, nowhere in directions is this mentioned. Horrible directions hoping support is better, finally figured wire install. The supplied wire had z axis wire marking on the wrong wire confusing things more, took leap of faith it was in error n plugged y into board n routed new long cable to new motor and plugged old cable into other half if y cable coming out board..it worked proper once turned on.Took few extra minutes due to poor directions n unhelpful video but unit works. Next up changing to direct drive extruder from Creality arrives next week.Upgrades done on new ender3v2 so far include this dual z-axis kit to provide proper support on x-axis for any droop. Bought the metal CR automatic leveling switch must have device greatly speeds up prints, had to add few extra lines to gcode in cura so every print runs autolevel after home before print starts. Also upgraded springs on bed and knobs to anodized red knobs. Waiting for creality direct drive extruder n nozzle to arrive. I have had success from first prints auto leveling is must have upgrade. Z-Axis upgrade appears to stiffen x-axis as desired but greatly dissappointed in directions thinking I will make YouTube video to show proper setup on Ender3v2 because directions are horrible. Will post updates once direct drive extruder installed. Looking for filament run out detector for direct drive upgraded ender 3v2.Update 18 Dec.Upgrade well worth it, great prints. Only reason lost few stars is lack of clear installation directions. Y cable attaches to the board. None of printed parts needed on Ender 3v2. Support was quick to respond.Very poor....No instructions come with the unit. The only instructions are the video in the Amazon listing. The video never shows that there are electrical connections let alone how to make them. Also, won't work for my Ender 3 pro (bought new, three weeks ago). Mine doesn't have the two bolts shown in the base of the power supply that the relocation bracket attaches to. No bolts & no holes for bolts. Now that I have almost completely installed the unit, I will have to uninstall it to return it.After spending time installing this and printing an upper rod bearing mount as the included one is horribly misaligned I finally was able to power up my printer, fully expecting the upgrade to a dual z axis to begin working and all I get is a high pitched whine from the motor and the OEM z axis binding. Had to quickly shut down my printer to avoid damage from the defective CHPOWER motor.Not pleased with this. I now either have to disassemble it from my printer or invest in a functional stepper motor to replace this junk.UPDATEAfter going back and forth with messages I was advised to disconnect the OEM motor and reconnect the CHPOWER motor. With this motor only producing a high pitched whine it points to a fault in the internals of the motor, as anyone who is familiar with electronics would know the potential for this motor to backfeed into the circuit board is substantially high enough that doing so risks damage to the main board. As my printer is new and functional I am not willing to attempt such a risky "test".I now have to conclude that A) not only is the motor with this kit absolute trash but B) any tech support is non existent.Please avoid this product at all costs and spend your money elsewhere on a much better product that actually includes a functional motor and upper bearing mount that isn't misaligned to the point you have to produce your own in order for the rod to operate correctly.