Saw them several years ago - the show is every bit as professional and entertaining as the first time. Yes, some aspects are the same - the "sibling fights" - teasing about who won dancing with the stars, etc - but loved it just as much as first time.
Sat at a table for 6 in the lower level - as in other casinos - this type of seating is pretty tight and not always really comfortable.
We bought full price tickets via Ticketmaster and about a month before we were due to leave - got an email saying concert had been cancelled. We were just about to request a refund - but were confused by the fact that the Flamingo site was still offering tickets for sale. Called Ticketmaster and had our tickets confirmed and resent. They claimed the show was cancelled and then rescheduled - but the whole thing sounded fishy - especially since Ticketmaster never contacted us to let us know it the concert was back on. So not sure if this was a D&M producer issue or a slipup on Ticketmasters part.