Glad to see this tread. I've thought about starting one, but was too lazy.
The main DefTech thread is fine, but Mythos discussion gets buried, as there don't seem to be many of us compared to owners of the "regular" DefTech lines.
FWIW, I have a pair of STS's in front and a Mythos Three in the center. I'm absolutely thrilled with them. For me, the reviewers' extravagant praise seems to be fully justified.
Previously, I had tried many speakers over the years and became convinced I'd never get high quality sound in my room, which is an acoustical nightmare (all glass and hard surfaces, even a concrete floor; no draperies, leather furniture, only a small area rug, open to a kitchen
). I now have a HT system that is competitive with (although very different from) my older, music only system (McIntosh, Luxman, etc.) which is installed in a much more acoustical friendly environment.
The rest of my HT system consists of a pair of SVS subs controlled by a Velodyne SMS-1 (yielding flat response below 15Hz) and four legacy Cambridge Soundworks Newton speakers in the rear. I remain of mixed mind about "upgrading" the rears to Gem XL's, as I'm unconvinced I'd hear much of an improvement, at least not proportionate to the cost. (The Newtons blend inconspicuously with the fronts in actual real world movie and music usage, even though they have a different sonic signature and are not in the same league as the Mythos. This is no doubt largely due to the adjustments made by my Pioneer Elite VSX-01TX's MCACC system.)
BTW, I was able to convince my local Magnolia to match the aluminum closeout pricing on the Three, even though I got a black one. I was lucky and found a great deal on a pair of flawless, nearly new floor model STS's at Abt, too.