Visions are made from recycled high density polyethylene, the more dense version of what plastic milk containers are made of. This type of plastic is not only very safe but very smooth and easy to clean. Also very very tough, very difficult to do damage to the cage.
They are not any more manageable than what you have though. I'm curious as to what aspect you might think one 4ft plastic cage is more manageable than another if the size is the same and the weight is comparable. In fact, if stacking them, square-top cages are easier to deal with than rounded and ridged top cages like Visions. With PVC cages sold for the hobby, you can put spacers between the cages if needed, and use anything from pieces of PVCx to flat pine molding. With Visions it is tougher than that, because the edges aren't square and for other reasons.
The HDPE plastic doesn't spread heat very well. That is, it will be warm over the heat pad and cold 0.01" away from the heater. That can be an annoying thing in a cold room if keeping boids. Lets say the heat pad is 90 deg and the room is 72 deg. In a Vision, the cage floor will be 72 deg right up to the heat pad. In a PVC cage in my experience under the same conditions, you see more of a temp gradient from the heat pad to rest of the cage floor. If your room is heated, then you don't have to worry about this physical attribute of HDPE.
All in all, Visions are very good cages and extremely tough. The heating thing is only a problem if keeping boids in cool rooms. You may need to put a light inside the cage to help with warmth in a Vision cage in a cool room, especially for a large tropical snake like a boa.