I got the El Diablo from CI mid last year. It's a terrible piece of crap, it lasted I believe 3 months and never held humidity very well.
CI said oh well, it's past the returned date. I don't buy anymore from CI and I certainly don't buy anymore cheap desktop humis.
That said Darryl is right. Get a coolidor. You'll outgrow a 300 count in 3-4 months. They don't hold nearly 300 either