What are the pros and cons of a cultured marble tub?
I have a cultured marble kitchen sink so I guess my experience is relevant. It is noiseless (unlike a stainless steel one would), looks as cools as a stealth bomber (much cooler that a stainless steel one would), can be washed no-problem.

Surely there're drawbacks - I always fear dropping a heavy fryinng pan onto it and crash it this way and obviously I remember to never use any acid-based compounds on it. IMO acid-based compounds can be easily avoided and fear of crashing is mostly subjective - likely something heavy needs to be dropped from a reasonable height to cause real damage. Other than that  I don't see any drawbacks so far.