The advantage of the upgrade kit is that you *know* it works. All the silly bugs have been worked out of it. The parts fit and do everything they need to do. The only thing that may be suspect it the BLTouch and Marlin. From what I have seen with the RC8+ builds (and some mods) the BL Touch works pretty well. Not as well as the inductive probe on my Mk2, but it even it could use a little help from time to time.