I can't explain it as well as peterpalmieri but essentially what you say is correct. With the Monique line level at noon and the M2500 volume at 10 o'clock the notes just seem to leap off my fingers. Not massive volume, just quickness and the ability to project subtleties of tone to the back of a large room without knocking anybody over. There is never a feeling of the amplifier working hard. With the M700, under the same conditions, i sometimes felt that the M700 didn't have much more to give me.
But that's just me. I play with a light touch, like to incorporate a lot of dynamics in my playing and want to feel that the amplification system gives me the same responsiveness regardless of what volume I'm playing at and always has a lot more to give if needed. The M2500 coupled with the Monique gives me that.
That said, I am VERY careful with the M2500 volume knob. I have no illusions that speaker damage is not a possibility. But thus far, no problems with my two GB F112s.
Regarding "punch," that is a concept that is defined differently by differently people. Last week I was playing this rig when a bass player friend of mine who had been standing at the back of the medium-sized room came up to me and spoke at length of his impressions of the bass tone. He said he could feel every note in his body, but not in a pounding way. It just had a presence without being overwhelming or too loud in the mix.
That's what I think of when I think of "punch."