I'd have to second that... the bass performance on these babies surprised me as well.
The pair of Kharma MP150s I have at home are fairly new, so I hesitate to provide a more comprehensive review, but, it seriously gives the Boulder 1050s a run for their money!
Also, in my setup paired with the VTL 7.5 Pre-amp, I actually prefer the Kharmas to VTL's own S-400! The MP150s are "cleaner" sounding overall and appears to be more tonally neutral. The S-400 is sweet overall and music is more textured, but the bass area was seriously compromised... perhaps it has something to do with the fact that I'm using Kharma Exquisite Midi speakers which are a somewhat difficult load, but the MP150s really bring out the bass performance on the Midis much better than the S-400 ever could.
Both my VTL 7.5 and the MP150 are fairly new, so I expect some run-in to take effect, but "right out of the box", the combination seems to be quite a magical pairing.