I like waterland tubs but they are a bit pricey as compared to rubbermaid or aquariums. Also, couldn't a newt/salamander climb out of one of these being the little escape artists they are? The sides on the smaller ones aren't actually vertical right? I had thought about one of the larger ones for my turtles or axolotls.
I do agree, they are nice. I suppose you could build some sort of top for one.