Great all season tire so far, haven't yet tested out snow conditions but I'm sure it'll do good, but that's why the low rating for now. Got 3000 miles so far, has been great. I will update after 10k and when it snows. Haven't tracked with it yet also, but has very good decent grip around corners. Overall, great tire for daily driving, I would highly recommend it just for that purpose.
Switched from the (discontinued?) NT830 and with only around 500 km covered I'm very impressed with the dry performance and the noise at speed. At low speed they kinda "fizz" in a not unpleasant manner. I've found them to be a bit "springier" than the old NT830s but they're new with 100% tread. It feels like the contact patches are rock solid but the sidewalls are allowing a little bit of lateral elasticity - i can confidently fire into 70 km/h corners at 100km/h and the lack of drama is almost disappointing! The car just transfers weight and the Invos deal with it contemptuously. I still haven't driven them in the rain and it never snows in my part of Australia so I don't see myself having the opportunity to review their snow performance. I'm going to give them a serious workout as soon as it rains, by which time they'll have bedded in properly and I'll be able to offer a better idea of the overall performance. Suffice to say, I paid $1100 for the set, and they perform like they cost three times as much.
I bought my car with these tires on them in Oct. 2012 and the tread was at half way and its Jan now and the tread is basically gone, I would say the tread wear is pretty bad. Driving in snow, the tires arent the best, but if you drive fairly slow (20mph in a 25mph zone, etc) you wont have to worry too much. Driving in deeper snow the tires make a good amount of noise and as the tires wear down they start making more and more noise. The tires handling is very good in wet and dry. The tires are comfortable but once again they start losing that once they wear down.