I can't say enough good things about my Kinesis wheels. But I'll try:
1) The quality of the forged centers is second to none.
2) The shot peened finish on the spokes looks purposeful--not showy.
3) They use true mil-spec hardware to secure the centers to the rim halves.
4) The 3 pc design allows you to more accurately select width and backspacing that looks and works right on your car. You can juggle backspacing such that you will be able to fit wider wheels on your car than you could if running mass produced wheels (Size and backspace options on mass produced wheels are generally limited to 1/2" inncrements). I'm running 18"x10" wheels in the rear of my 68 without any wheelwell or tub mods.
5) Caliper clearance is exceptional. Too good actually. The mounting pads (offset) could be smaller--which would result in more backspacing.
6) When running my car at ten-tenths, I never worry about wheel failure.
7) They're extremely light. I swear that I can feel the difference during cornering and braking.
8) The curvature of the spokes (profile) on the K58's is a perfect styling match to 1st gen Camaros. They look even better on Andrew's 70 GTO.
9) They're expensive, so you never have to worry about the guy down the block having the same wheels.
10) When parked, women come up to the car, study the wheels (because they look like jewelry), fondle the texture on the spokes, and then ask to have sex with me.
That pretty much sums it up. Here's a pic of mine.