I stopped practicing taiji a while ago. The only thing I still use from it is the silk reeling exercises. I find that xingyi is better for striking, baguazhang for footwork, but the taiji body mechanics are GREAT for qinna. I caught a back hook kick one time and just ripped a guy's hip out of place - I was only studying Chen taiji at the time and had just given up wing chun and Shaolin.
I practice Yang Long Form under YMAA - I love it and I think it is stopping me getting injured from the other style I train in (Longfist/White Crane). It also improves leg strength in a way I never felt from anything I did before - that slow movement seems to really solidify the muscles, and in turn even the weirdest White Crane stance becomes that much easier. We do tend to focus on application/bunkai or pushing hands stuff a lot, which is good, as I need it, even though I'm dreadful at it - (in TKD we never learned any form of chin na or close quarter blocking etc really). There are classes where we don't actually do the form at all. Occasionally we do TaiJi ball and silke reeling practice.
Cheng Man Ch'ing's 37 form primarily. Have done William C.C.Chen's long and short forms, Chen style first form, Sun style short form, Beijing 8 and 24 forms. Chose to concentrate on the 37 form, sword form, and a Wudang cane form.