Maybe a question better served up in the 1st gen JCW section.
I would question you're husband's definition of "turbo lag", though. There are a number of dynos posted now that will pretty much show it's non-existant on the S, let alone the JCW.
As far as "throttle lag"... I have heard that as a complaint from one GP owner. My experience however, is that the throttle lag on the my buddies '04 JCW is waaaaayyyyyy more evident than on my '07 JCW (with the sport button "on", of course).
I will say that I believe Swiper to be a
nicer car in many ways... but a
FASTER car? Doubtful. Sorry. Not buying it.