At 22,700 miles, I replaced my OEM with upsized (255/50r19) Quatrac Pros. I had 4/32" when I replaced the OEM. I would have gone a little longer, but snow season was starting.
I now have 35,500 miles on my Quatrac Pros, and they look like they'll make it to 50,000.
Pros: Quieter, more comfortable, way better rain traction, WAY better snow traction, >2x tread life, less expensive.
Cons: Poorer steering response, ~5% range loss (closer to 10% when new.) Note: both of these may have been exasperated by the larger size.
Larger size...
Pros: . Extra 1/2" of ground clearance, softer ride, and better look.
Cons: see above, plus ~0.3 second slower 0-60 (after considering the needed 3% speedometer correction), speedometer error. OEM speedometer read 1.5% high, now it reads 1.5% low (e.g. 68 is really almost 70).
One more thing, if you increase the tire size, 255/50r19 is about as tall as you can go on OEM rims. See:
255/50r19 quatrac pro on Gemeni w pics