Rather late to this, but the band I'm in has 2 guitarists and we both use PODs going straight to main mix (no backline amps). Main mix also has vocals. The drums are acoustic (and loud) and the bass player has an on-stage amp. None of the drums or the bass are in the PA.
We used to have foldback speakers, which were heavy. Our drummer got himself a B205D which he was happy with, and so the other guitarist and I got one each too. Now we don't have foldback speakers. Given that the B205Ds are on mic stands they can be very close and so give a good 'in your face' volume even against the most valiant thrashings of our drummer and matching bass.
We haven't had any feedback issues with them, even though they are close to the vocal mics (placement of the B205D that takes into account the mic's cardioid pattern probably helps).
We put the same mix into the foldback as the FOH is getting. We don't have a sound guy (and neither do the venues we play), and having the FOH mix coming into our faces lets us balance our guitar and vocal volumes on the fly. If the drummer gets louder (as he does) and the bass goes up to match it we can adjust our individual B205D volume without affecting the FOH balance.
We're very happy with the way it's working so far.