I am still planning to get it after they incorporate the errata. I don't actually mind the overprice, considering it will be only our fourth 5e book in four years. I don't think the content is all gold, but the majority of it is.
The good:
- mostly doubles the archetypes for all classes (except Wiz/Cle); IMHO the PHB archetypes were still a bit too few, and too specific for some classes (e.g. Sorcerer), so this expansion greatly helps players to play a class closer to the way they see it [50+ pages]
- very good spells additions, even if they are not entirely new [25 pages]
- very useful narrative suggestions for all classes [~10 pages]
- fairly good expansions to tools proficiencies [~7 pages]
- downtime activities, although there seem to be many reprinted from the DMG, perhaps with only small additions [~12 pages]
The meh:
- traps rules are nice, but examples are lacking
- new feats could have been much better and so much more than just racial feats, as they had at least 3 UA articles on feats plus a few more feats scattered around in other articles, surely at least some of those must have received positive feedback; instead they ended up with the most boring of the sets, significantly reduced in size, and almost all of them are just "half-feats" with an ASI
- new rules all cover very minor things, and a couple of them are seriously poorly thought-out
- random encounter tables, useful but always feel like they should rather be freebies, since they are not true design work but only gathering of existing information
The bad:
- 20 pages of names, but the actual number of names is very small, thanks to an atrocious layout that is mostly empty