I recently purchased a 2015 SH-AWD. It does have some transmission quirks, but nothing so bad that it was a deal breaker. Mostly, hesitant or slow shifts, but nothing major, and I actually really like the push-button shifter. Overall it's quick enough, quiet, and comfortable.
I was choosing between this and a Q50, and went with the TLX because of better MPG, more features, more focused towards comfort (quieter, smoother), and better reputation for reliability and quality. The Q50 was definitely sportier and faster, the interior felt nice, and the infotainment system was prob better. For a family car I liked the TLX. If it was just me it probably would have been the Q50.
2015 TLX 3.5 SH-AWD Fathom Blue/Graystone