I've had my VP150 for about 2 weeks now (along with m60ti's - review and pics forthcoming, I promise!) and haven't noticed any sibilance or any issues with off-axis response. In fact, my wife's favorite seating area is just to the outside of the right front speaker and she has not had trouble making out dialogue.
Regarding bass, I am hardly an audiophile but I have also been pleased with the VP150's range. I cross my center at 80hz and the sound seems very full to me.
I'm sure there are better speakers for *more* money, but considering the 30 day trial window, I recommend that give the VP150 a try. You may have a more discerning ear than I, but you should at least hear for yourself.
Bill
