I use them for all my snakes that get large (i.e. burmese python and BCI's) because I believe it's just a waste of money to buy a nice glass terrarium or aquarium for something that's gonna outgrow it in a few months. They're cheap and easy to maintain, plus the lids come with latches so you don't have to worry about going out and buying locks for a screen lid, or about the snake getting out. They also hold humidity and heat very well compared to any glass enclosure. But for lizards they don't worry very well... I would never keep a lizard or even turtle in one of these!
Just my 2 cents. Hope it all works out for you