This supplement is not bad, but this is not for me. It has a good number of useful things, but overall, in my opinion, this supplement's design doesn't follow the simplicity of the 5th Edition of D&D. It feels like it wants to bring back the complexity of the 3rd/3.5 Edition, with a multitude of weapons and rules' detail that simply don't fit in the game.
The armors and shields are fine. They fill the lacking spots of the armors in the book (for example, an AC 15 heavy armor, or an AC 12 light armor that gives disadvantage on Stealth).
For weapons, it introduces a variety of new keywords for weapons; for most of them you need to add bonuses to the special attacks (grapple, shove, disarm), which doesn't follow the design of 5E. Alternate is probably the best keyword here. It also adds a myriad of new weapons, most of them are plain useless or needless redesigns of existing weapons. The repeating crossbows and some other weapons are ok. The gear section is ok. Has some unneeded complexity, but here is easier to pick what is useful and what is not. The exotic lists are not for me, as it has that 3rd/3.5 Edition feeling.
The wealth guidelines are fine. The trinkets are ok as well. The magic items price/values table is the most useful part of the magic items section. The other tables (i. e. Who Created It...) are ok. The rest is, again, unnecessary complex. The final part – investiments – mostly talks about a gray area of what players can do with their gold, which is hard to rate... but its not bad.