I am going to be buying a new thermostat soon and want to see what people are saying about their herpstat pros now that they have been out for a little while. I plan on buying one of these to run my adult racks and hatchling racks since there are 4 different probes and zones and I will be able to just use heat tape and not have to worry about heating the whole room. Are there any downsides to this thermostat? I was looking at the HS2, but for the extra $100 I can control double.

edit: and what is the deal with the USB and software?