I've thoroughly enjoyed the time I've spent beta testing Summit and look forward to the new builds.
Colin has provided excellent feedback on Summit. So have so many of the beta testers. I too am looking forward to publishing new builds.
If you're on the beta list (which you can get on by putting your email address in the form on this page) and you haven't gotten Build 15 yet - please let me know. Build 16 is due mid-September.