This is a good question as I was terribly optimistic about after the op, all of my worries were about the operation itself.
I had complications, nothing too serious and 5 days back in hospital sorted them right out and I have been pretty much fine since.
However, I think even the 'normal' post bypass niggles can be difficult to cope with too. There are definitely times I wish I hadn't had it, or that I had a band, but I know in the long term this is the right thing.
Rx