I have used every version of R#, and to be honest, I just can't imagine having to live without it.
Today, I finally uninstalled the latest nightly build of 4.0, after using several versions of the previous 4.0 builds. I was pleasantly surprised by the quality of the first 4.0 builds, but every build it got worse up to the point that it is unusable at this time. The only reason I'm still using VS2005 for most of my projects is the lack of a decent resharper build vor VS2008.
I don't know what Jetbrains are thinking. I don't think ANYONE cares about all the fancy new features they're adding to this release. Everyone just wants C# 3.0 support, nothing more. Let me repeat: nothing more. I bet the majority of 3.x users are more than willing to pay good money for C# 3.0 support.
Let me make a suggestion to Jetbrains: forget about new refactorings and fancy features. Just implement syntax checking for C# 3.0, and get a stable version out the door. Version 3.1 was superb, it didn't need any more features. "Featuritis" is a decease that has killed many great products, and the way things are going now, R# will be next.
You haven't lost me yet as a customer, but I'm sure there are people who are tired of waiting for 4.0 to be released. After all, how long has VS2008 been around?
I'm very disappointed.