You should have made it a multiple choice poll, since many of us own multiple stats of different types.

Myself, I have 4 ZooMeds (they still work perfectly), 2 Johnsons, 1 Ranco and 1 Herpstat. They all work great, tho some are more accurate and require less tweaking than others.
I like my Johnson stats best, since they are relatively quiet, have the indicator light, and don't have to be set too far above the desired temp (tho that isn't about the stat as much as the enclosure setup). The Herpstat is really nice so far: quiet and small, even tho I've had to set it to 105 to get 92 in the rack tubs.