I'm running 235 Studded General Altimax Arctics, so pretty wide, but I wanted wider summer wheels/tires so I decided to make the OEMs my winters.
The TC does work quite well; keeps things from getting too out of control, but isn't overly invasive, unless you're being obnoxious with your maneuvers.
With the TC off, the rotation of the car feels very loose, but the trajectory is very stable. You can easily throw it right into a 30 degree drift and it just holds beautifully, it will drift all day long. The open differentials don't appear to be causing much grief either, plenty of forward traction, and it feels balanced. You floor it and it just straightens right out.
Would love to try out an STI and see how it differs, with all the wizardry of the DCCD and LSDs.