FOLLOW UP REPORT
I've run the LTZs ~18,000 miles as I use them only fall/winter and still run my stock Forteras in the summer. There is ~85% tread left and admittedly I do quite a bit of highway driving although I'm a bit aggressive when running the LTZs. They're NO louder than when I put them on and the tread is wearing evenly at ~32psi and no chunks out of the tread either. The tires are still compliant and rubbery feeling even when it's cold. I still love the LTZs!
If there is one nitpick, it's that they're not a good ice tire like a Blizzak, but what is? They're better than other AT tires I've run except for one so far: the Goodyear Duratracs I run on my Wrangler are noticeably better traction-wise when it's icier. It's not a fair comparison, Wrangler vs WK2, but I've driven enough on both and even tried the Zeons on my Wrangler.
Yeah, for some style faux pas embarrassment, I put the Zeons onto my Wrangler (yes the 20" wheels and needed spacers) temporarily to compare winter grip to the Duratracs. They're close in road snow conditions except on the ice where the Duratracs edge them out. Maybe additional siping could help? I could not put the 17" Duratracs on my Grand, so this was an unscientific trial.
If I was going to want pure winter/off-road performance over looks and handling, I'd run 18" wheels and Duratracs because 17" wheels don't fit over Hemi WK2 brakes. If Duratracs came in a 275/20-55, I'd have to think a bit as the ZEON LTZs are better on dry roads and overall handling.
Any way I look at it, I'd certainly buy the Zeon LTZs again. Hope this helps.