The guys are absolutely pro on both disks and the lead singer is incredible. The only real difference between the two CD's is that the first one had absolutely NO backing vocals. Every single song was a good band backing up a solo singer. It was boring. The second had them all over the place and it was like a different - and much better - band. Heck, even the old Elvis stuff had those guys throwing in those corny two or three part backing lyrics. It just adds interest.
You aren't going to use it much on songs like Born to be Wild, but there is plenty of opportunity to do it. And it is amazing what it does for crowd response. I've witnessed it first hand. Your band goes up a few notches in everybody's heads so that even Born to be Wild, with no backing vocals, seems to sound better.