TPAB is pretty good, I'm enjoying the funk, jazz, neo-soul beats. It's a lot more to take in than GKMC, and doesn't have really any standout tracks that are easy to listen to compared to GKMC. You won't find a banger like Swimming Pools or Money Trees, however I'm a big fan of Wesley's Theory, King Kunta, The Blacker The Berry, and i.
If I had to compare the two, I'd say GKMC is a lot easier to just chill too, and that you can pick out a track seamlessly and enjoy it. With TPAB you'll have to really focus to take in all of what Kendrick's lyrics is about, and the album is probably better to listen to from start to finish as it's more cohesive to listen to that way than to just pick out certain songs.
TL;DR - It's great, give it multiple listens to really appreciate it. It's one of Kendrick's more ambitious albums but also feels very personal too.