They are awesome wheels. They are at "classic" status when it comes to wheels. If you like the look and wanna win the game, by all means, pick up a set. My whole thought on them is different though. For about $200 each, you could get a set of Enkei RPF1's. They weigh in at less than 10lbs. If you can stand that extra 1.4lbs, the 949 Racing 6UL is a steal @ $130 a corner.
I'm no wheel offset/size wizard, but both 15x7 and 8 will work. I guess it just depends on or intentions. Volks have an excellent reputation though. They make a great product. Keep in mind that it won't be pretty if you curb one, or just damage one in general. You'd have to not only pay a lot of money for a replacement, you'd have to wait too as Volks are usually a special order from a distributor that sells them. With a more common-readily available wheel, your wallet won't hurt as much and you be back out on the road sooner.