I ride a Z2 and it's one of the finest bikes I own. I always look forward to riding it as it does everything well.

Price - that Z1SL you're asking about is in the low $5000s for the frame alone. The rest of their product line ranges above $3000 for the frame.

Mine was a pristine shop demo that I picked up for about 2/3 retail back when retail was around $2500 (it's currently $3250). These days, no way I'd be riding one. Too expensive for my tastes.

Reparto Corse carries them. http://tinyurl.com/uz34y Read 'em and weep.