I can vouch for the reliability and accuracy of the habistat brand.
When i first started with reps i got one of the cheapo wall thermostats, absolute pain to wire and not the most accurate. The wiring diagrams were totally incorrect
Now using habistat, so easy, just plug it in, no need for a sparky and i have found them to be super accurate. For the extra say 40 bucks between the wall type and a proper herp thermostat there is no comparison.