These early 70's groupie films were one of the most uber-depressing cycle of films I've ever seen, and really make you wonder why ANY girl at any time would ever want to be a groupie since it inevitably leads to heartbreak, squalor, venereal disease, and a tragic end--the only apparent upside being getting to sexually service talentless hair-ball rock musicians like the real-life band Forever More. The bleak ending of this is SO bleak, it makes you lose sympathy even for the protagonist herself, which is one reason why I think the similar UK film "Groupie Girl" is definitely superior to this one (the girl in that is also serving as a sperm dumpster to slightly more talented musicians).
My personal favorite film in this cycle though is the German film "I, a Groupie", which features the incredibly sexy Ingrid Steeger and at least provides a lot of eroticism along with the downbeat degradation. The girl in this, Maggie Stride, is not unattractive, but definitely pretty ordinary-looking compared to the smoking-hot Steeger. And speaking of smoking-hot, apparently the famous Collinson twins, stars of Hammer's "Twins of Evil" have a small part in this film, but I'm not sure where exactly (they also appear, much more prominently, in "Groupie Girl").
Lindsay Shontieff is an interesting director, mostly for his rather black-hearted view of humanity--even his outright sex comedies like "The Big Zapper" contain some memorably nasty, misanthropic turns. He does use some interesting devices here like flash-forwards that give glimpses at the ultimate fates of many doomed characters. The band Forever More meanwhile comes off like such a collection of untalented and unlikeable douchebags,you have to wonder why they agreed to be in this (or why they didn't subsequently sue Shontieff). Still, while this movie is definitely inferior to "Groupie Girl" and "I, a Groupie", it isn't totally bad (like the aptly-named American groupie flick "Bummer!"). But definitely don't expect to be uplifted here.