I was incredibly excited when this was announced last year, as I love constructs and playing characters who make them, however this was mostly a letdown.
Most of the archetypes are just terrible, some like the Paladin one are unbelievably bad, trading away class abilities do something the altered/ruined smite already does. The Wizard one trades away all bonus feats among other things, in return for...a bonus feat. And +50% cost/time to every construct they ever make. Truly amazing.
The bard archetype however I will say was very interesting, though it's weird they gave bards the new way to reanimate constructs.
Alchemist can now kill themselves as an immediate action, so that's great. 1 con drain to heal a homunculus 1d6HP per drain. Phenomenal.
Additionally, in combat healing of constructs is still at the same awful level it's always been at. Fast healing 5,and 10 minutes of greater mending. Have fun.
The one good thing to come of this book are some of the new Templates for constructs, but most of the interesting ones are priced high enough as to mostly be DM territory. Steam was great though, as was the repaired one.
Somewhere between 1-2 of 5 stars, but we round down in Pathfinder.