Royden,
I've kept my neo gtp's in rubbermaids, but only until they're a little over a year old. At about 12-14 months they are big enough to go into a permanent adult cage.
As for what drew me to them, I've always liked boas and pythons as well and kinda saw the green trees as the top eschelon. Besides their obvious beauty, it's the evolutionary adaptations to life in trees that I find so fascinating and different about them. Kinda like chameleons. Imports can be difficult but true domestic bred gtps are very hardy, kinda like chameleons. They also make great subjects for display vivaria, kinda like chameleons. The colors and patterns of gtps are HIGHLY variable, kinda like chameleons. I'm thinking there may be a correlation....