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[Ozzie]

The maximum size...no idea. I never reached the limit!
But a simple look on the homepage offered this insight:

Supporting files with sizes up to 16000000000 GB

7ZIP is stable and from my side it never created a corrupt archive, as long as you don't use the beta versions, at least.

I additionally used ECM for my 78MiB archive of Secrets of Pyramids, a tool that compresses CD images and makes them better compressible with tools like WinRAR or 7ZIP. I learned that this program can corrupt your CD image sometimes, so I would only use it with caution...