[WanderingMinstrel]

After modem problem (also reported several times on XDA) resolved itself while I was attempting to flash back to EC05 and an automatic quirky OTA update to EF10, GB has been rocking. Suggest anyone who tries this goes for the update ASAP.
Now I'm just past the fatal 24-hour period in EF10 with no problems.
Pros: No more modem lockup in AM, much better battery life than original EF02 (which was lousy), camera works nicely, GPS is great (loaded first time in 15 sec). Netflix plays (woot). I'm loving it again.
Cons: Slight lag on switch from portrait to landscape, really sensitive touch screen, occasionally noticeable auto-brightness changes.

Best of all, if it craps out again, this time I think I finally know what to do. Learning new stuff is really good for my brain cells.