I tried mic-in on the PMD620 the other night for Gare Du Nord at the Mezz in Breda (the Netherlands). Not my favorite band, but my girlfriend likes it, so I thought it would be the perfect opportunity to experiment with mic-in. Church Audio STC-11 (omni caps) > PMD620 (plug-in power, 24/48, attenuation -24 dB, levels at -10 dB).
The first set, I was in the back, near the bar, and there was a LOT of chatter and pushy people. At one point, some drunk girl actually tapped one of my mics and said, "Wat is dit?" (What is this, in Dutch). On the recording, you can quite clearly hear my irritated, "'Dit' is you fucking up my recording!!!" That's not in the sample, although funny, as it is the worst part of the first set.
http://www.box.net/shared/yeqycgo0k4The second set sound is considerably improved, as I was able to move up front, between the soundboard and stage. Still a bit of chatter, but much, much better.
http://www.box.net/shared/0x1jcf7i84I am pretty impressed, actually. Not nearly as good as with the ST-9100 in the chain, but still pretty solid. If I had to go minimal set-up, I would be more-or-less comfortable doing so.
EDIT: +T for the photos, kbergend...That is a mighty small pre-amp. My 9100 is a bit bigger, but still makes a compact set-up with the 620...
Also, I should point out that these samples are totally unedited. As if you couldn't tell!