I've recently upgraded from Snow Leopard to OS X Lion and from XCode 3.2 to 4.1. But roughly said I'm unhappy with XCode. The reasons are many but the main one is I can't search the documentation installed. In 3.2 I used to be able to have incremental search-so as I typed class and other references where displayed and I could choose the one I needed. But in 4.1 most of the time I can't even type in the search area. It just freezes and won't let me type. Does anybody else have this issue.
It's quite odd but after a while the problem with the documentation just disapperared. Now I can look up any API reference. But anyway i still find the old style Xcode and Documentation nicer and easier.