I have the opportunity to buy a used Little Giant forced air incibator from a woman who's had it for six months and has used it that whole time. Is that a lot of use? She's selling because her DH built her a mini-fridge incubator. It's a good price, I just want to make sure I'm not getting something that will wear out soon. I have NO idea about incubators. What should I look for/at when buying a used incubator? Thanks.