I would opt for a good set of locking skewers for your wheels and then a very good U-lock for your frame, I use an Abus Granit Futura 64 Mini, locking skewers for my wheels, and a Kryptonite Flex cable for my saddle. The Abus Granit Mini weighs only 695g and is a breeze to carry around, I have used the locking mech thousands of times now and it is still butter smooth.

I have a friend who has the Tigr lock and decided to stop using it because it rattled on his frame a lot which annoyed him, he also locked up many times a day and found the locking mech annoying to use. He just linked me a video which shows the thinner version of the Tigr lock being bested by bolt cutters:
http://www.youtube.com/watch?v=kb8YoT9Q9VA

The videos on the Tigr site only show it being tested against a crappy $15 U-lock, I would like to see it tested against the top-of-the-line Abus, OnGuard and Kryptonite locks, I doubt it would prove more or even equally secure. The top locks from these companies are even cheaper than the cheapest Tigr lock. Don't buy into the hype.