My Inc has been running great with the leaked Froyo, although I have had a couple of small issues. No deal breakers though.
1. Root apps keep asking for root permissions even after I have given it. (titanium specifically)
2. A few more FCs than usual, mainly seesmic, but I just moved over to another twitter client for now. I really do like the full screen widget for the built in twitter client.
I did install the patch for missing market apps and the gmail 0 problem and those two issues are gone.
Overall, better performance, and better battery life without having to bump charge, although charging is taking longer.
And one more bigger issue I am having, when I plug in to charge (charge only on pc) or to my car charger, it seems to make my sd card unavailable. apps, such as listen, will give me "sd card not installed" errors and will not work unless unplugged.