On my bike that I would have a tendency to leave outside, I use pitlocks (wheels, stem and seatpost) along with a TiGr titanium lock. I guess it works. My bike hasn't been stolen, but I don't think anyone has tried either. My expensive road bike I just don't leave it anywhere.

The reason why I went with the expensive titanium lock is it's light so I always have it on the bike. Best lock in the world is worthless if it's left at home because it's too heavy to carry.