I have bought Edirol R-09HR recently and it was my start with taping. I tried internal mics bfore I bought external, and I tried them even later. My bad was using too high levels which caused:
-heavy disortion (once)
-too loud bass (twice)
However bass can be greatly filtered in postproduction and I got two shows sounding very nice (for a begginer) already so I can say I am satisfied with internal mics (You can pull a satisfying recording not only for Yourself). And those were loud shows. Only bad thing is that recoring unit is size of palmtop and it's hard to have it 'up' (maybe lie on hat? I never tried) so after handhelding it for two hours in front of my face (covering half of stage) i was exhausted, but it's surely possible to work something out (if You are high maybe front pocket of Your shirt and some smaller people in front of You would be enough).
Last thing, (someone mentioned) R-09HR is new version of R-09 and it's more expensive, but I heard someone bought it for 275$ brand new with some microsoft cashback offer (it's explained somewhere in retail space forum). Hope that helps.
Phil