i almost purchased the SO homing switch kit, until a friend found this:
not only does it have switches for both ends of X and Y, (so it does homing AND limits) but it comes with a full probe set and mounted banana plugs; all solidly built and available in 2 colors (i think), ready to mount in existing SO3 holes/mounts.
at what cost? just $5 more, it seems! $79 vs. carbide $75?
are there any better kits out there that can do better for less?