i use them on the jag as i have 20" wheels, been more than happy with the falkens, and at that e options are limited. if i had the cash i'd put more expensive tyres on, but the pirellis that come as standard are just shy of £2k i paid alot less for the falkens put it that way, but they more than meet my needs.
as has been said above, they are a mid range, and the lowest value of tye i'd stick on a car. but they haven't let me down yet.
ultrac seesantas are worth a look, again another mid range, but i'd say a little better than the 452's
Conti 5s are good, and from what i've heard PS3's are the mac daddy.