The Good: Fairly comfortable, rails don't bend.
The Bad: This saddle might not suit you if you are moderately or very flexible. Regular retail prices are expensive.
Fizik have a guide, this saddle is for 'Bulls'. That doesn't mean you should only buy if you are overweight, it's an indication of your flexibility. If you can't touch your toes than this is the saddle is for you, one of my friends isn't very flexible and he loves this saddle. I bought it and for me it's solid and alright, but I also have a Tundra 2 and I find that more comfortable, as I'm somewhere between snake and chameleon, which means somewhere between very and quite flexible.
As the underside of the saddles are fairly similar, are Fizik saddles worth it? IMHO, yes, if you can get one cheaply, the full retail prices are nuts, as the material cost seems pretty minimal, and it should always be possible to find a saddle you really like for half the retail of a Fizik, if that's a Fizik on offer, great. Just be careful you buy the right one for you.