Personally I enjoy it and consider it the best thing to happen to my career. Couldn't do it all day every day but doing support on the side is rather enjoyable IMO.

well, depends. i like having to deal with customers since that makes me able to build a better product -- dealing with customers makes you realize what they want.

(disclaimer: i work at olark)

It's also awesome to interact with people who are legitimately happy about the stuff that you build.