Keyless ignition is quite nice to have. You walk up to the car, it unlocks when you pull the door handle, you sit down, you press the go button. Never once need to touch the key. I wouldn't make it a buying point but it is pretty slick.
It's tough going back, though. Having two most-often-driven cars that were "keyless", we found we really missed it when we got one without it 
Great for women - throw the fob in your purse and forget about it.
I've had an occasional embarrassing experience when I let the person with the fob out of the car, though. You can keep driving for as long as you don't turn the car off...
It does up the cost of a lost key to something entirely unreasonable, though.