Headfirst, Badfinger's last studio album is worth buying as part documentary evidence of its demise, part musical value. That having been said, however, I think the band was in sharp decline musically at the time this was recorded--of course this was brought on by their wretched emotional state in reaction to their exploitive contractual situation. Anyone who buys this album will want to buy the book "Without You," which documents the band's tragedy and serves as a warning to any aspiring musician.
I highly recommend that you buy Golder's Green and 7 Park Avenue, the two posthomous collections of band leader Pete Ham's home recordings. Ham, apparently, was strongly committed to the band and its democratic structure, but when one compares Ham's output to the rest of the band, it seems they both made a big mistake thinking Ham was anything other than a superior talent who should have had at least half of each album reserved for his songs. Ham's work is more melodic, more rhythmic, better lyrically, and he flat out sings circles around his mates. Badfinger soared in direct proportion to the number of Ham compositions on each album, in my opinion. Apparently, Ham was often frustrated when his mates rejected numerous of his songs. Hard to figure.
Head First's Ham compositions (especially Lay Me Down, Smokin' Gun, Nothing To Show, and Keep Your Country Tidy) are the main highlights. although "Rockin' Machine" on the first CD is charming, and some of the demos on the second CD are actually better unfinished--sometimes the band overwhelmed the gentler material by going a little too heavy. I really think that the other members besides Ham were bottoming out creatively when this was made, a trend that one could see through the band's history. Ham was the man, if only he had known it.
The purported single attempt, Lay Me Down, is better in demo form, I think, on the second CD.
I'd also buy Badfinger's Greatest Hits, if I were you. It has all the hits, the best of Pete, and the better songs by the others. Long Live Pete Ham.