Great (but a bit exhausting),
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This review is from: Kissology Vol.1 1974-1977 [DVD]  (DVD)
This really is a goldmine for Kiss fans: more than six hours (seven with the bonus disc) of terrific, no-frills rock 'n' roll performances (plus a wonderfully cringeworthy Gene Simmons interview that's worth the price of admission alone), all from their golden '74-'77 period. The picture quality isn't always great, but the fact we have this rare footage in the first place makes up for that, and it's really fantastic watching the guys in their prime.
The only thing I will say is, take it in small doses. While it's all great stuff, the sets tend to repeat themselves and it can become a bit tiring if you decide to watch it in one go - there's only so many times you can hear them play Firehouse or Black Diamond before you need a break. That aside, this is a must-have for serious Kiss fans, and even casual Kiss fans will have to try hard not to love it.