Quieter than I expected. The sidewalls are appropriately stiff for this type of tire but they're still comfortable for street driving. On an auto-X course the level of grip is similar to the Toyo R888's I had on the car beforehand and they're much less darty on the highway. Breakaway is progressive and they make enough noise to let you know you're approaching the limit. I haven't had them long enough to comment on treadwear but they were bought for an auto-X car so I don't expect them to last. Supposedly not as grippy as the latest generation of 200TW tires but still a great choice if you can't get anything else in your car's size.
These tires were awesome! I was able to drive my LT1 Firebird with ease in the Michigan winter. A little common sense while driving goes a long way. I have recommended these tires to friends, and will be putting them on my Fusion when it needs tires in the future.