Stainless chains are fine for those that understand about cross chaining and AVOIDING it. But if this person is having chain problems now, it could be even more problems with stainless due to the galling effect that occurs with stainless to stainless contact. Add this to the excess lubricant and you have the perfect conditions for accelerated chain, chainring and cassette wear.
I am NOT saying that Stainless is bad. Anything but that. I have had success with these chains on Tandems for timing chains, and for the long runs in recumbents that are easier on chains. Your results may very...