I have the VE-300 and I love it, had it for 2 months now and it never failed, its accurate, has audible alarms if temps get too high or low. I am currently using it for my green tree python vivarium but I am going to buy another one when I get my rack. Id recommend going with the VE-300x2 its only $60 more but you get another probe which can control another rack if needed in the future.