I have a vp150 and found it to be a bit too generous on the deep end with not enough brightness on the higher end - most notable with dialog. I tried used a pair of m2s, on their side with tweeters turned on the outer ends.
My receiver is an Anthem D2 and has different settings for center speaker to compensate for placement (like a shelf, or top of a TV) Using the different setting, and applying them to the m2s and the vp150 I found I could get several "sounds" from both set us. In the end I've settled on using the pair of m2s. Dialog seems a bit brighter, clearer and seems to cover a wider spectrum in terms of sound placement. In the end it's all about room acoustics and what works for the individual. But I found the difference quite amazing in terms of how different it all sounded blending with the rest of the system.
- Scott