Durability is excellent - they'll last a lifetime. The plastic material used is easy to clean - urates do not stick to it very well.
Heating is another thing. The material doesn't insulate as well as PVC material. If your room background temp is warm, then heating is easy. If the room temp is cool, then you'll have to do some inventive heating.
Some models have a heat shroud - I think the 2ftx2ftx2ft model (the 222) does as does the 3ftx28"x1ft model (can't remember if this is the 322 or 332). The heat shroud is a good thing, but the rest of the cage may still be cool in a cold room. You may need to add some Flexwatt below or else fix a heat panel to the ceiling depending on the species you are trying to keep and the temp of the room.
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Mark G