Only one of the above posters addresses the primary weakness of the WattPuppy, and only does so indirectly - up through and including version 7, the speaker used a Focal tweeter that suffers from an audible resonance in the mid-treble, and this makes these speakers sound fatiguing to many people. The version 8 and Sasha use a different tweeter that is much smoother. This problem has been widely written about - I suggest that you go back and read the Stereophile reviews of the various versions of the speakers, and especially, John Atkinson's measurements in those reviews.
I think the WattPuppy 6 and 7 are great speakers, don't get me wrong, and I seriously considered buying a pair of 7's, but the dirty tweeter is the main knock against them, and it is a legitimate criticism. Not to pile on, but the midbass hump, the low impedance in the bass, and their phase performance tend to be the other complaints - these issues remain with the 8 and the Sasha. They do many things extremely well, however, and it's important to judge them on the totality of their performance, which, overall, is excellent.
I think the WattPuppy 6 and 7 are great speakers, don't get me wrong, and I seriously considered buying a pair of 7's, but the dirty tweeter is the main knock against them, and it is a legitimate criticism. Not to pile on, but the midbass hump, the low impedance in the bass, and their phase performance tend to be the other complaints - these issues remain with the 8 and the Sasha. They do many things extremely well, however, and it's important to judge them on the totality of their performance, which, overall, is excellent.