I have the Edirol R1 -predecessor of the R-09 - and have been exceptionaly satisfied with it.
It is bigger and bulkier than the R-09, uses more batteries and uses bulky, expensive compact flash format memory cards, needs to be turned off before plugging in the external power supply, etc… So I can only assume that the R-09 (which fixes all of these points) is a better device. I have read that the R-09 does not have the same range of built in effects, but since I don’t use them anyway, this would not bother me. Doing it again, an R-09 is what I would buy.
The best point about the R1 are the inbuilt microphones. Since the device has no moving parts, there are few background noises to disturb them and their quality is very good. Excellent for field work. Maybe one of the competing devices (e.g. Marantz?) would be more suitable if you were looking for a recorder to plug into a PA setup to record a band gig, but the R1 can do this too, just plug the mixer output into the line in on the R1.
I place it on the table in the middle of a session and leave it on for the whole session on external power, recording at it’s best MP3 quality. With a 1Gb card, it could do over 12 hours at this quality… If it is sitting on something soft, e.g. the carrying pouch that comes with it, then it is relatively insulated against people knocking the table. Afterwards, I chop the MP3 file up on my PC and throw most of it away, keeping only the tunes that I am interested in. Strangely, Transcribe! has proved to be the best tool for doing this chopping, although I need to convert the output back to MP3 once it has chopped.
Alternatively I have placed it on a table several metres from the group, and tried to get a better balanced version of the sound. Don’t place it in front of a banjo player if you can avoid it.
I have also used it at home, simply propped up on the music stand and play… Works great. Here I often playback the device directly through my stereo system since I am mainly trying to get honest impressions of how my playing sounds. Playback through headphones would be an option too.
The playback mode has a A->B loop function and the ability to play at half speed. It would be nice to have a wider range of playback speeds available, but you can’t have everything.
When recording, it is important to set the input level to something that is loud enough, but doesn’t overload the device. There is an optional limiter built in, but it is still better to avoid the music being too loud for the device’s range. This usually involves me sitting in front of the device and asking everyone to play as loudly as they can for a note or two… If I was really paying attention to the device(i.e. not playing myself), then I would fairly constantly monitor the input level and adjust according to the individual pieces being played - but I rarely do this.
Hope this helps.
Chris.