I actually saw these live in 1971. It was very different from the run of the mill pop that was around at the time.
The performance was actually very good. Interacted very well with the fans, and all in the band (or Group as we used to call them "in the day") seemed to be really nice and genuine.
Surprised that a few people think that the lead singer sounded like Noddy Holder. Never got that myself, but thats not a comparison to have made.
It really was the Golden age of Rock and Pop.