Very nice extension. After Microsoft have been removed the macros in Visual Studio 2012, I was bored to don't have this feature. When you have a big solution with many projects, it help to don't have to wait before the entire process even if your firsts projects failed.
I love this addon. My only criticisim is it defaults to being checked. It would be nice if there were some settings to allow it to be easier to use. I rarely want it on a rebuild and it would be nice to be a seperate build button on the toolbar instead of a checkbox. It does perform well and does not seem to have any problems with memory leaks or conflicts with other extentions. All in all it is a great extention. It would be perfect with a few small updates.
Like the best ideas, deceptively simple and very effective. I appreciate that the author spent the time to make it "...activate the error window after cancelling the build", so you get straight to the problem.