I have a Neo that is 8 years old. No cracks, no discoloration.
Cracking is caused by owners who improperly heat (overheat) or try and attach an extremely hot ceramic emitter in a socket directly to the plastic cage without a junction box or heat sink.
Discoloration is normal for ABS plastic exposed to ultraviolet light but does not affect strength. I have a shelf liner from Neodesha that is used in an outdoor bunny hutch. It has been subject to sun and rain, Winter and Summer for about 5 years. It is discolored, but as strong as ever. I can kick it, bend it, whatever with no brittleness.
I'm not saying Visions are not excellent. I'm saying that Neodesha cages are not flawed in some way such that they had to go out of business. I imagine the competition from Vision initially took its toll. Speaking for myself, I really like the simple, sloped-front design of the Neodesha cages. So easy to access, clean and see what is going on before you open the door. I have Visions, Neos and other types of plastic cages. The Neos are my favorite though.