JetBrains have made a 4.5.1 maintenance release of ReSharper available for download. It is a free upgrade from any 4.x version, and the Release Notes indicate that a large number of bugs have been addressed. Despite some issues I had with the Beta version I happily found the 4.5 release to be stable. I have been regularly testing the nightly builds and think that 4.5.1 will be a stable and reliable release.
It felt like the Beta was offering performance improvements but in the end has been completely unusable for me. I have experienced Visual Studio hangs or excessive CPU consumption after performing builds, during debugging and at various points when navigating around the solution. After rolling back to version 4.1 I haven’t had any problems. Fingers crossed that the quality increases dramatically before the final release.