Just like the title says - they're pretty good instrumentally. The actual instruments sound exactly like a Pink Floyd album. However, I did not like their vocals. For example, when they started playing Shine On You Crazy Diamond, it was really good, and the crowd went nuts. However, for me at least, as soon as they started singing, it killed the whole song for me. Granted it is a tribute band but it does not compare to the real experience.
I should also add that I love BB King's Blues Club, one of my favorite haunts in New York City. They always have the kind of music I love.