Personally $25 for a thermostat sounds too good to be true. To me the thermostat is the most important part of a enclosure. To be that cheap they must have cut corners somewhere.
I think this may be something great to use for a aquarium set up or for a small rack housing normals.
I would just advise against using this on a rack with anything other than normals in it.
So far, it's worked for me. I have Albinos, pieds, a lesser platty and a pinstripe being heated by this. Unless it were to completely goes haywire, it won't heat above 108.