i had a reptitemp 500R and i wouldnt trust the thing as far as i could throw it..

it could have been me not understaing how to use it, but i now have a johnson and i like it MUCH better. no temp spikes or anything crazy. the reptitemp would be at what i thought was an "okay" temperature and it would drop to 72 (!!!) and spike to 114 (!!!) neither of which i want to ever subject my snake to.

my advice : if you're in the market for a new thermostat, invest a few more bucks and buy a johnson or a helix or something with a better set of customer reviews.