I’ll use mine several times a week and then take a 1-2 week break with it off, and the battery has gone down a little but is never dead. Have had the R2R2000 for almost a year now with no issues.
It’s been fantastic sounding too. I love the smaller compact size vs my HM-901 or my previous HM-801. Sound wise I like it the most, but they’re all good. I gave the HM-801 to a prominent head-fier who had his stolen a few years back - Fang told me back then that I should have kept it since it’s irreplaceable. But I think he would now agree that the R2R2K did in fact work as a suitable replacement.
I’m going to get to try it with the HD800s via 4.4mm jack this weekend. So looking forward to it. If it doesn’t drive them well, it certainly has no trouble driving my HE-1000SE, so no loss for me.
Also, has anyone tried playing music from Amarra Luxe into the R2r2k via USB on a Mac? Are people back to using iTunes on Mac, or sticking with Tidal and Amarra like I saw in previous years?