Ill throw in my 2 cents here

I HAVE BOTH

yes, i have a Herpstat, and a Hydrofarm on/off thermostat

I gotta say, they both work AMAZING.

the hydro farm is keeping my leopard gecko warm and happy at 95 - 97F, and my herpstat keeps my boa nice and warm at 89 - 91F.

They both work amazingly. if you cant afford a Herpstat, get the hydrofarm 100% I have had nothing but good experiences with it so far