Well worth the download!
The original tracks are great, and the addition of the extra material, while not essential, do make for interesting comparisons. I think the unreleased version of Mama's Little Jewel (titled here as Black Scorpio) is much better than the original. The live tracks at the end don't feature Mick Ralphs, but feature the later version of the band with Ariel Bender on lead guitar. Well worth the download!