Okay, here are my .02 after using the R-09 for the first time at a show two days ago.
First of all, I think it sounds great. My impression is that the A/D is a huge improvement over the SBM1/D100/M1. To me it sounds beautifully crisp and transparent and makes the stock SBM1 sound grainy and flat in comparison. So I guess I disagree with those who have compared it to the SBM1.
pros
-long battery life (Using 2500mAh rechargables, I recorded about 3.5 hours at 24/48, and then another 3 hours of 320kbps mp3 the next night. The low battery message came on later that night during playback.)
-super easy to use; all settings and menus are very intuitive
-it's small
-very accurate level meter (could be a little slower though), the peak light is also very useful
-internal mics are suprisingly good sounding
-you can't turn the thing off while recording (even if hold is engaged)
-A/D sounds great IMO (see above)
cons
-display may be a little too bright for stealth operations, same is true for the red REC LED
-build quality is rather poor
-I'm getting occasional drop-outs during playback
-lack of digi-in (has been discussed before)