I got one of those hydroponic/jump starts and I seem to be the only person that hates it. It was only like 20-30 bucks but for us I feel like they're just bad. I set mine at 90 and it wouldn't turn the mat on until 87 and then it would turn off at 91 and climb to 92 or 93 non stop. I'm sure those temps are fine and all since it still had to go through the enclosure's wall and that small amount of substrate, but I hate the idea that it was turning on and off so much. Not to mention it was mechanical so every on/off there was a noticeable click that got annoying.