A bit underwhelming. Everything was under seasoned, but was rich. So it was heavy on your palette but had little flavor.
I got the Hubert Keller burger, modified to kobe beef and smoked gouda. Couldn't taste the cheese, couldn't taste the meat, all i could taste was the steamed spinach, which was off setting.
Quick guide:
Buffalo meat = more lean, robust meaty flavor -- recommended.
Kobe beef = Soft texture, under seasoned, very mild flavor.
I'd try a different burger place in vegas before I return.