Summary: Like all Definitive speakers I've used the Mythos 7 is an excellent center speaker. It it compact, the main reason I bought it, but the audio sounds like a large speaker. I highly recommend the Mythos 7.
Summary: I am using 1 x Mythos 7 (center) in a 5.1 set-up with ,2 x Mythos XTR-40s (main), the Supercube 2000 (subwoofer) and 2 x UIW64/A Round In-Ceiling Speakers. I am delighted with the performance. I have had surround sound systems since the early 1970s (Quadraphonic) and this set up is easily the best. The listening area is ~10' x 15' and these small speakers are more than adequate. The Mythos 7 does what a center is meant to do very well.
Summary: I purchased this to be the main center channel speaker in a mid-priced system in my family room. It can distort at louder volumes, but is fine for "normal" TV levels. Given its small size, this is an accomplishment. I think it would take a considerably larger speaker to play at movie levels.
Pros: Small, I don't have room for a deeper speaker. Good looking.
Cons: I wish I could drive it harder without distortion.
Summary: I bought 2 Mythos Six and a Seven along w/ a ProSub 800 for center, side & sub speakers for a new Samsung plasma and although they're still new to me, I really like the sound of the outer speakers. The Sub is a little bit "all there or not" but the Mythos' are all great...look and sound terrific.
Summary: I got these after five years of requests to downsize my Polk RTi A6s from the wife; they sounded amazing but were just too massive. I tried the Klipsch G-42 passive soundbar first but was dismayed at how pathetic it sounded compared to my beloved Polks. Sent it back to Crutchfield and called up to ask what they would recommend. Two different salespeople pointed me to Definitive Technologies and holy cow am I glad that they did.
Summary: i bought this mainly because of who made it (I bought a def. supercube subwoofer, based on amazon reviews, and it is really great) and because of its size. i wanted something that would fit in front (at the bottom) of my panel, without obscuring anything, and it does, no problem. the sound is Ok, and a big improvement over using two fronts, but i do not find the sound quality anything special. however, i am not much of an audiophile.