First, the price I put is the price per tire.
I got the KM2s because I wanted mud tires on my Jeep, and I'd heard nothing but good about the KM2s. I had a little trouble getting them, because they're so new, and one guy at the shop told me they'd be back ordered for a month, but another guy found them through a different supplier.
They look BAD!!!!! (In a good way).
On road, they do hum a bit. First time I started driving in my Jeep, my reaction was 'oh-oh, am I gonna like this??', but after just over a week of owning them, I've done 250 miles on the interstate, and the hum doesn't bug me at all. Handling is
a bit different, but not bad. I think it's mainly that the tires just grab stuff (including the concrete) better than the stock ones did. It's an adjustment, but like I said, you get used to it pretty quick.
I haven't had too much chance to wheel yet, as I've owned them just over a week, but the little I did off road, there is ABSOLUTELY no comparing these puppies with stock tires. The ride off road is so much smoother, you skid around less, etc. I love 'em.
EDIT -- I went out with a bunch of guys a month or two ago. LOTS of mud. Everyone running A/Ts was getting stuck right and left. Other people were surprised at how well I did, and I'm pretty sure it was mostly the tires.
The only thing I will say about the KM2s (and this applies to all outsized tires) is that you WILL notice what feels like less power. It's just the gear ratio, and can be fixed with different gears, but it is a little disconcerting. If you don't know that's going to happen, you could get a little surprised by it. I saw it coming, and I was a little surprised by how much power I lost. But like I said, change the gear ratio, and you're fine.
All in all, I love my new tires
EDIT -- 6 months later, this still holds, except now it's more like I wouldn't buy any other tire.