I took my 8 year old daughter (her idea). I am not a big concert goer and haven't been much of a VH fan since Dave left in the 80s but when I was 13, I bought their first album and remember being blown away by its utter rawness and garage power. The thundering bass, the torrential drums that sounded like an approaching stampede of buffalo, the mind-boggling guitar licks, topped off with powerful, almost boogie-rooted vocals from a guy that could hit this note when he screamed that was completely off the register. This band sounded like nothing I'd heard before. If this concert could even come close to recreating that feeling I had when I was a kid, it would be worth it for me.
We showed up when Kool and the Gang was about halfway into their set and yes, I too was skeptical of VH's choice of having them as the warm-up. But as I settled in and watched and listened, I started to get it. If you strip away the heavy metal overtones of Eddie and Alex's sound, what you end up with is clearly rooted in down home boogie and funk (think "Beautiful Girls", "Ice Cream Man", "Everybody Wants Some"). Dave even said as much during the show when he mentioned that they played Kool and the Gang songs back when they were a club band. And to be honest, everyone in the place couldn't resist getting up and dancing during an extended version of "Jungle Boogie". Do yourself a solid and get to the show on time. Trust me, it will get you primed for VH.
VH came on around 9pm and the entire packed arena immediately stood up and erupted (and did not sit down again for the entire show). I won't get into every song they played but suffice it to say that the warm, nostalgic feeling came roaring back into my gut and the hair on the back of my neck stood up. During the first song, you could see Dave's face light up because he could feel the energy and adulation coming from the crowd. The whole band seemed pretty excited about the crowd's reaction and it came through in how they eagerly tore into each song and smiled at each other as if to say 'hey, this is going pretty well.' After the third song, Dave went over to Wolfie (who by the way, was thoroughly solid bass-wise and spot-on vocally throughout) and said "I told you I'd be better tonight!" which leads me to believe that he may have been rusty in the previous performances (which is reflected in the some the earlier comments on here).
As for the various criticisms of the Diamond One (speaking some lyrics, forgetting lyrics, not hitting notes, etc), everyone needs to understand that first and foremost, Dave is the ringleader and showman that makes this band accessible to the audience. Without him, this would be 3 guys buried in their instruments, playing admittedly incredible rock music, but lacking the connection with the crowd. Dave is there to basically say "do you believe what these guys are doing behind me?" At the MSG show, you could sense his giddiness as they successively ripped through the old nuggets that made them great. During the mounting climax of "Hot for Teacher", the VH brothers and son were grouped around the drums playing intently while Dave repeatedly looked back at them and then back to the audience, basically saying to us 'pay attention to this.' When the song ended, he commented how there is no other band in rock and roll that is capable of putting such a biblical ending on a song. Regarding forgetting the 1st verse of the new song, I am almost certain that that is staged for our benefit. He's done it from the beginning so I think if he needed to, he would've learned them by now. Same for complaining about the air vents. It's all part of the act. As for speaking some lyrics, singing in different key, etc, it's what makes it interesting. It is something all lead men do (see Mick Jagger, Bruce, Robert Plant) to mix things up a bit. If they sang you back the album, you'd get bored. So give Dave a break. His shtick makes the whole thing work.
So if you like what I like about this band, go see them. It's well worth it.
BTW, my daughter said it was the best night of her life....Mission accomplished.