I got the True Blue songs off iTunes. Apart from the sound quality (mono!), they're great. I especially love "California Bound" with a hard-rocking ending and "The Farewell Bend" with a brilliant slide guitarist.
I've heard some of them on youtube now. They're all of a piece. Very listenable. The vocals sound relaxed. Guess I'll grab them off iTunes or another vendor (as opposed to going whole hog on the boxset).