This may be a rare case in which the previously unreleased tracks (a session with different musicians recorded a year after the issued session) are better than those on the original album. Unless the album was released before the second session was recorded, I'm really surprised that they didn't use the second session, or some mix of the two.
Of course, this album's particularity is the quintet + choir format. Once you get past the slightly dated weirdness of it all, there's a fair amount to enjoy. It starts out great with a funky "Hey Hey" (yes, the female voices do punctuate the tune with "hey! hey!") in which the voices serve a rhythmic role. Carlos Garnett injects squealing free/blues energy and under Woody Shaw's solo, Freddie Waits plays an almost free-time funky swing not quite like anything else I've heard. Actually, it kind of sounds like... Nasheet Waits.
The last track of the original album, "Ghetto Lights" is the other highlight, as the vocal writing is at its most multi-layered. Nice solos, too, but nothing that equals the stunning version on Bobby Hutcherson's "Dialogue."
Waits is perhaps the album's main problem, actually. He often sounds a bit over-eager, which is probably the last thing you want to be when playing Hill's music. An egregious example is on "Two Lullabies," when Waits injects a heavy back-beat as if to kick Shaw's solo into a higher gear, but seems as surprised as we are to learn that Shaw's solo spot is actually over. He then fumbles his way back into a quieter groove. On the very next track, he does something similar at the end of Garnett's solo, but, not having forgotten the form, nails it, so the fill serves as a full stop. Also, on the title track, he and Richard Davis don't gel at all, so the tune sags a lot despite some nice solos.
None of these problems occur on the second session, with Ben Riley and Ron Carter. The whole session sounds, on the one hand a lot smoother, on the other, more conservative, despite the vocal arrangements being slightly better.
I wonder if Hill's late '60s shift away from his more difficult music is a sign that the opinions he's expressed on Cecil Taylor had already taken hold at that time. The problem is that he becomes a little too mainstream and his music loses its strength, becomes a little too ordinary, whereas the mid-60s albums are all momentous occasions. It seems to me that "Dusk" and "Time Lines" strike a good balance between these two poles.