I rotated and interviewed at UTSW.
I loved the program and the residents. It's not necessarily a "top 20" program overall, but it's very good. No program is perfect, but you're overall education/learning experience is good, and they get a lot of good fellowships.
First, trauma is king there. The have great traumatologists and their new program director from WashU (Dr. Borelli) is also a traumatologist. I think the Joints, Spine, and Hand are pretty well covered. I think F&A is solid, but thin. Probably weighing most in my decision not to rank it number one is that I did not feel the Sports and Shoulder services were up to par. I interviewed with Dr. Borelli one-on-one and he basically told me the same thing. His vision is to improve those deficits by bringing in more faculty, plus providing more academic teaching sessions, on the level of the top programs.
I also interviewed at WashU, and thought it was a great program. Maybe the best from an educational standpoint. I just didn't click with the residents and felt the place stuffy. Dr. Borelli did enjoy hearing my thoughts on WashU and talked about it a lot, but I definitely think he is focused on UTSW and making it a "top 20" program.
Just from my rotation, probably the best strength of the program is the residents. They're smart and just seemed to be good guys/gals. They work their asses off (me too on my rotation...be prepared), but it's very front loaded. The 2nd and 3rd years bear the brunt of the work and then as 4th and 5th years, you pretty much show up to operate. Kinda nice.
They also operate fairly early. Not the earliest I saw, but definitely more than the big name academic programs. Depending on your upper level resident, you can expect to be doing a lot in the OR as a 2nd year, and most as a 3rd year. My only wish was that there are more faculty so the junior residents are truly one-on-one with faculty in the OR. Dr. Borelli said he was working towards that goal and that the state (or whoever) had approved a ton of additional faculty slots.
Anyway, that's my two cents. Hope it helped. Very program, and I seriously considered ranking is #1 until close to the end.