This is ostensibly a biopic of the famous Dolly Sisters, 'icons of the jazz age'. I can't say how accurate it is, as I don't know anything about the Dolly Sisters. However, given that they were brunette, while Haver and Grable are blonde, I suspect it isn't terribly so.
However, as entertainment, it is superb. The leg-show is well done and tasteful, the costumes and acting superb. Yes, the plot is formulaic 'boy meets girl', albeit multiplied by two. John Payne plays his normal selfish rogue of an entertainer, while June Haver and Betty Grable are scrumptious in the title roles. The film was designed to show off Haver and Grable, and it suceeds in this. Although I'm reliably informed the two were at each other's throats off-screen, on screen, they make a most agreeable double-act and are believeable as sisters.
The print is excellent, and the DVD includes the film trailer and newsreel footage from the premiere. If you like Betty Grable or technicolour musicals, you'll love this item.