Okay, just given my R-07 its first real run in the real world, a weekend festival.
Battery:
After 4 hours of recording the battery level is just down one segment, so whilst not on the M10 level of miraculous battery life it should be okay in practice.
Bluetooth:
Never had a problem testing in the house, but in the actual venue the connection always failed whenever I went into the app. The device was in my pocket, and the phone was in my hand, so we're only talking inches. I could only get it to work by switching the phone off, and back on again, which is clearly going to be a pain.
Dual levels:
My setup was Church CAF mics > Church Ugly Battery Box > R-07 so no amplification at all, but using the dual levels with the safety track the minimal level of 42 is clearly too high for my requirements. I was recording loud bands, but not THAT loud, and the main track was peaking into red. I ended up switching the dual recording off.
Sound quality:
Really not bad, at least not noticeably different to the Sony M10.
So now I'm undecided. I love the idea of subtly checking levels on my phone, but if the app is going to freeze all the time it going to be no better than just looking for the green flashing lights on the M10. I love the idea of a a safety track, but if the main track is always going to peak there is only effectively one track.
In practice I think this will still prove to be a useful recorder, just not as useful as hoped. I'll be recording one track only, rather than two, so have the full range of input levels, and monitoring for the first 10 mins without closing the app on the phone.