I have the NY Faghettaboutit (or however the hell they spell it). I do feel that my bike is plenty secure with it because I know that even if someone was going to take the time to cut the shackle, they'd have to do it twice. Apart from maybe the freezing technique, (which I just learned about today and am skeptical that it could be applied on a properly locked bike, i.e. lock not on the ground) a grinder is basically the only way that someone could compromise this lock without doing damage to the bike itself. Hopefully by the time they cut it once, their grinder's battery will have died or their cutting wheel would be spent. Obviously the downside to this lock is that it's incredibly heavy. I bike to school so I generally just leave that lock there so I don't have to tote it around. I use a lighter u-lock that I keep on my bike for use at locations other than school, and for when I am at school (I unfortunately have to leave my bike unattended for several hrs each day), then I have two u-locks. With my bike having two u-locks on at school, there are always easier targets on the rack and unfortunately it happens often.
As for the security skewers, I can't comment on the pitlocks but I had another type of security skewer that was compromised...as far as I could tell, they just used a hammer to hit on the part of the skewer that's on the outside of the fork until the wheel broke free. I was considering the pitlocks but after that happened I figured ...what's the point? If I really want to protect my wheels they just need to be u-locked.

My advice is save yourself some money, don't put crazy expensive wheels on your commuter that are more likely to be stolen, and just buy a basic security skewer like this one:
http://www.amazon.com/Sunlite-Lock-n...ecurity+skewer

Then lock up with one u-lock around the rear rim and frame.