This is going to be risky, given the direction of this thread.
My experience with the 150's are that they are a decent, small, speaker that goes very loud and can take a real beating and still keep on functioning. I find the bass muddy and not very tight at all and the midrange sounds constrained. As I can not find much clarity in the midrange, when added to the fact that the bass seems to boom, I really don't believe that these speakers are a great match for a pair of mains in a HT system or critical music listening. For example when my friend brought over a pair of his SVS speakers and we set them up on stands next to the 150's I have, the difference in the sound quality was tremendous. The SVS midrange was crystal and revealing. They didn't fatigue even after considerable listening and still continued to reveal sounds that the 150's just couldn't seem to reproduce. They (SVS) don't have much of a bottom end, but what there is is tight. Both will need a sub. This holds true with what I heard when I also compared them (150's) to a pair of Triangle Titus 202's that I own. The difference in the midrange between the Triangles and the 150's was nothing short of stunning. But its not fair as this is the Triangle "claim to fame"
Of course I did no level matching and my playing around is not meant to be any kind of scientific comparison. Also keep in mind that the SVS cost much more than the 150's and a pair of Triangle Titus 202's, even used, cost upwards of $350 a pair. So should the SVS and Triangle sound better? Of course. Do they sound $300 better? Matter of opinion, an mine is yes. If all you listen to is the 150's you won't have a frame of comparison so you will be happy. If you listen to other speakers alongside them...
As I have posted before, I use my 150's in my music room where I practice guitar. I play them HARD and I play them LOUD, and for that they are outstanding. I'm not really looking for any sort of critical listening experience. And at less than $50 if I blow one up, who cares?
Of course this is just my OPINION and is not meant to knock anybody else's opinion or to infer than anybody else is wrong and I am right. It's just how I hear it. I would go with SVS or Triangle, or one of many other good bookshelf monitor speakers out there. But then, not to be arrogant, I don't have to worry about budget either and I change speakers often just for the fun of it. Right now in my home I have Wharfdales, Triangles, Infinity's, Vandersteen, and a great pair of old Vintage Altecs I picked up as a project. I have also owned, Dunlavy, Axiom, and too many others to remember.