First off, this is the first time I've tried ReSharper for VS 2005, although I used it before with VS 2003.
I tried the EAP build 204 and had a few problems:
1. It seems that it did not install the keyboard map file (ReSharperKbd.vssettings), and the first time I ran VS, it complained that it couldn't find the file.
2. ReSharper doesn't seem to know about the new "InternalsVisibleToAttribute" for .NET 2.0. It complains that some of my methods are inaccessible when in fact I can access them.
3. The built-in unit test runner: WOW! I love it. However it takes ages to start my unit tests. I was using TestDriven.NET and it started my tests up within a few seconds, with R# it takes a minute or more. Debugging a unit test takes even much longer than that (but does eventually work). Once the tests finally start, they take much longer to execute than under TestDriven.NET, or even running nunit-gui.