They cost about $250 now (£200)... I don't know if the price has come down dramatically or if the price was misprinted somewhere, but I'm looking at them too. My concerns are that I can't find any trustworthy looking reviews either. There are people recommending it on youtube but they seem to have referral deals with amazon (click my link below type thing). On amazon there only seems to be a single review (which I always find suspect because when there are low numbers the seller could be reviewinng it). I like the idea and thought about something similar as an arduino project but then I saw a commercially available one. I wanted to do something that had an inbuilt fan for air exchange and a 5w vivarium heater mat to keep the temps right too. This was all before I remembered I don't know what I'm doing and can't code, so this seems like a better option from that point of view. Has anyone used one of these over the last 5 years since this thread was started?