I haven't had the opportunity to go to Guu Izakaya so this location is my only experience with Guu... and wow! What an experience Guu is!
It's loud and it's hot, but I think that's part of what they're trying to do in there. Maybe just don't come if you feel a headache coming on ;P
Our food took a while to come out and there was a point where it seemed that our waitress forgot about us (as it was a very busy and packed Saturday night) but all the food tasted amazing so in the end, it ended up being quite worth it. Prices i would say are reasonable... it would probably be equal to having a nice dinner at The Keg and that was without sharing things with the rest of my party (we each ordered 3 dishes). Needless to say, I was very very full.