We loved the British Invasion and still miss them a lot. Probably an age thing, or maybe the difference of Disney using their 'magic' in presenting the illusion of a Beatles concert vs a bunch of very nice and talented guys doing covers of various bands over various decades.
Yes, they are good. Worth seeing for sure, and have to say I'm very glad they are still there after the recent 'cleansing' of live music entertainment at WS.