I've been using FSRs for a year as my zprobe. Even after much tweaking, it just didn't work as well. I've looked at other various zprobes, including the newest IR ones (which didn't work with my PEI bed). The hall-o effect probe just looked too complicated and I was too lazy to build it.
Having a ton of cheap microswitches laying around, just did a quick build on a mount for it. Works quite well with 626pilot's firmware with the smoothieboard.
There are 3 pieces. You need to print:
3x 4.8mm magnet m3-5 footer - this mounts to the effector plate arms using some short M3 screws.
3x 4.8 #6-10 which attaches to the top of the microswitch platform using #6 screws. Sorry for using the US screws, but I had a bunch laying around, and getting metric screws can be a pain sometimes.
1x microswitch lower platform.
You will also need 6x 3/16" cube n48 magnets. I got mine on the cheap from amazon, but I've seen them on ebay as well.
I printed mine on ABS for strength.