I was running it for a couple of days. The biggest improvement I noticed was with stepping though the code while debugging. Before the update it would sometimes take up to a second to step through each line, now it is a more reasonable response time. The only issue I had was I could no longer create Web Application Project as I received the following error: Error: this template attempted to load an untrusted component 'Microsoft.VisualStudio.Web.Application, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. For more information on this problem and how to enable this template, please see documentation on Customizing Project Templates. But I found a solution to this posted on ScottGu's Blog: This is caused by a bug with the SP1 Beta setup. You can fix this with the SP1 Beta by closing VS 2005, and then open up the "Visual Studio 2005 Command Prompt" (there is an icon for it in your Start Menu->Visual Studio 2005->Visual Studio Tools folder), and run this command from within it: devenv.exe /InstallVSTemplates This will correctly re-configure the add item templates and make everything work fine.