Recount works well until it breaks. When Recount breaks, it causes more problems for World of Warcraft than any other addon I have ever used. I have a top end PC and when recount breaks badly enough, I will lag like crazy despite that.
If I come back to WoW, I'm probably just going to dump the addon and find something else. I kind of wish Blizzard would just build their own damage meter. Everyone has one or posts one, anyways.