Exactly.
I have in my house:
QS8's, VP150, M80, M3 bookshelves, M22 on walls, M2 on walls, VP 150 on wall, M3 in ceiling for atmos. And I'm looking to get more on walls for another room + a sub which will probably be SVS again as I do not consider the Axiom subs a good value. But I've never heard an axiom sub so really I can't comment on it. I have SVS and HSU subs as well as a small Polk.
I replaced Polks, Paradigm, Vega's, and a few other brands all with Axiom's. As a DJ for 12 years, and I worked in a/v sales for years as well, I've seen a few speakers. The only speaker of the bunch that disappoints me is the original VP150 center channel (it's old, from 2004) as vocals in movies could be a little better. It's not horrible but compared to the rest, it's the weakest and I need to run it a touch hot, multeq seems to have fixed 90% of the issues I had with the speaker when I switched from Yamaha to Denon. The On Wall VP 150(brand new 2014 model) is perfectly fine. I'm also struggling with qs8's now with Atmos, as Atmos really requires directional speakers. They are excellent otherwise though and one of the better surround speakers on the market and I'd highly recommend them for any 5.1/7.1 setup.
People are entitled to their own opinions of course, and I always welcome other suggestions. Just like anything on the interweb, make sure the advice you are getting is from valid sources with real hands on experience vs. rumors, speculation, accusation, and self profound experts. But at their price point, they are good deal imho. Sure I'd rather have studio 20's instead of my M3 bookshelves, but I paid $400 for my maple M3's, and around here (Canada) studio 20's start at 1400/pair for black - so yeah they better sound better.
Just to add, weirdly enough, I'm sorta the opposite of the OP. I have always wanted to try Def Tech, especially their on walls. But their prices really scare me off. When you get into that price range, you really have a lot of choices out there