I've had these tires for a little over a year, and I'm already down to 4/32. Granted, I drive about 300 miles a week for work, so I put a lot of wear on the tires, which is why I went with something with a warranty in the first place. That being said, I've seen 6/32 of tread wear in a little less than HALF of the warrantied treadlife, which is unacceptable. It's like they're expecting people to have to warranty replace the tires.
That being said, until recently these tires have been a dream. Road noise was virtually nonexistent, steering is reliable, and they're the only tires I've experienced that can actually handle snow slush. Once you get to 4/32 of tread depth, though, you'll start experience squealing tires on turns, sluggish response, and road noise increase tenfold. These are great tires for people that won't put a ton of wear into them.