Yeah, I doubt most in-walls could match the dynamics of the SX-T2, SX-8300, or SX-6300.
I've heard Revel and KEF in-walls at dealers. They sound good, but I thought the NHT SuperZero bookshelf sounded better.
I never owned in-wall speakers.
I do own four in-wall Velodyne 10" subs. In terms of sound quality, they are not even in the same ballpark as the RBH 1010 or Funk subs. But they serve their purpose well enough just like most in-wall speakers.
So my opinion of in-wall speakers and subs in general is probably much like Walter and most audiophiles. If I built a custom home, I would use in-walls for my family room and other rooms. But I would use the big 61" RBH SX-T2P/R towers for my PERSONAL HT room.