I get why getting a table at this place is such a pain, it's awesome!
I usually dont have the patience for anywhere that has a wait time but Guu is worth it. The first time I went, my friends conveniently left out the screaming hello/goodbye part and I nearly hit the floor when we walked in. Once you're seated though, you totally get into it.
The food is to die for. Particularily the sea urchin. It was on my list of always-wanted-to-try foods and I was not disappointed. We had a birthday in our party and they sent over what could only be describes as a tower of flavoured liquor shots.
If you're looking for fantastic food and an electric ambiance, Guu is the spot.