otoh, just last week I had my R-1 batteries die (I watched it shut off - I was waiting for a good time in the set to do a swap), and the file was perfectly fine. I was ready to swap when the batteries died, so I only missed prolly 20secs or so of music. I run it on Energizer 2500mAh's, but I got some new batteries (exact same ones) and it records much longer on new batteries...
I personally would consider the inability to use a 4gb SD card as a deal breaker for me. I know that if I had to swap out 2gb SD cards that I would lose one of them. Its only a matter of time, and I know my weaknesses.