I've had my KDWS tires for the last 6 months, and I have got to say they are well worth the money, kind of hard to believe they are an all-season tire. I would need a very strong reason to buy something else. That said, if you aren't driving your car in cold, snowy weather, you don't need them.
The KDW tire is great in warm weather, but don't try to drive it through a cold winter except on dry days, as the tread compound is truly not made for cold weather. Until the tires warm up, even 40F is a little too cold for them - traction will suck, especially with gears. I can light them up from a 30 roll with a stock 03 GT on a cold day on clean, dry pavement. You'll be wearing off rubber with no benefit. On the plus side your friends will be convinced your car is a monster
AFAIK, the KDW2 doesn't come in 245/45/17.
IMHO, you might as well buy the KDWS over the Traction TA, as the price difference for the whole car is a whopping $30 from tirerack.com.
Any reputable tire shop will refuse to mount anything wider than a 245 on 8" rims, as a 245 is really the widest that will fit. Some shady independent shops might, but when the tire comes off the bead on a cloverleaf, you'll be paying, not them. And if you've ever seen a set of 275's next to bare 8" rims, you wouldn't be asking lol