ARS Racks are well built, and will last a long time. They can handle more weight than just about any other rack (freedom breeders are about the same)

Each level has its own plug and can be controlled independently.

I generally go with the rule 1 square foot of floor space for every 1 of snake (a little less is fine espicially for young snakes)

Keep in mind that because they are open style racks you will have to keep the room they are in at the cool side temperature (which means that if you are keeping multiple species they will have to have similar cool side requirements)