IPA, the point of the nightly build system is that you always have the latest available code base only ~4MB away. The later the build you can test on the better, but the important thing is knowing what build it was you had problems on. Every build is labeled with a date and SVN revision now in the filename, as long as you don't get creative with renaming them it should be a matter of noting the filename to gather that information after you find a bug. These aren't RCs, they're just the flow of progress. They're not intended to be final just yet, but they should be very close, and most people seem to be happy with the overall development since 3.6.9. We're working on increasing that percentage now (hopefully to include Mac users eventually). That said, as bugs are being fixed every day it doesn't help a lot to repeatedly state there is a bug when it has already been fixed. A 'good build' then, is pretty much the latest you can find if you're going to actually try to find and report bugs.