I've heard the Cat 12's and a few submersives, they are extremely great, theres no doubt about it. When I was thinking about upgrading my T12's I had only 3 company's in mind, JTR, Seaton Sound and Danley. I couldn't bring myself to buy anything Danley because of how narrow my room is (would likely be a nightmare) and the fact I've never head anything from them. The Seaton Cat 12's would have been right up my ally if not for the fact they are powered. I don't want self powered speakers in my HT ( I like buying amps and changing gear). If Mark made a passive version? I'd be all over it. I'd be willing to bet he's loosing a ton of customers just for that one reason, plus It's a huge pain in the but to put up wall plugs for surrounds etc. (if you had to wire them in in an already finished room) If Mark had a rack mountable DSP to go along with his speakers for the xover, and give the user the amp choise instead of built in to each speaker, I think he could reach a entire segment he's not currently targeting (or at least, not reaching). I'm sure he's got his reasons for not doing so and of course thats great, I'm simply looking at it from my eyes as a customer of HT gear and it's of course it's only my opinion. He's always been very helpful on the forums and of course makes amazing gear. Who knows, maybe in the future.
As for JTR. I knew the sound, Jeff although slow at responding to emails etc, is always great to talk to and has always been willing to make me custom speakers he doesn't offer. Thats the kicker for me. The willingness to help someone out and get exactly what they want/need to make things work for them. I love my Noesis but I will never keep them forever. I like changing stuff to much to keep anything too long. I like to think I'm a companys dream guy. I will buy anything new to try out and will usually go though a certain line of speakers before moving on to something else. (I've done the entire paradigm line from monitor's to Sigs. Entire PSB line from alpha to platinum, etc. I just like to monkey around. No wonder, as of yesterday I've just finished my 59th DIY sub
Though I've kept my Mal-x 21's and FTW 21's the longest of any speaker I've ever owned. If Jeff comes out with line better than the Noesis, I'd also be all over it
of course the price also has a lot to do with it, Seaton vs JTR as most people already have amps.
If you live long enough then even you will kiss your Cat 12s good bye in favor of something else. 
