I like this product. It's a nice collection of weirder backgrounds. I only allowed the Tinker and Seeker backgrounds into my own game, but your own tastes may vary. The backgrounds are set up pretty good, though the formatting is a tetch different than that found in the PHB (not a big deal!). The tinker background includes a Tinker's Bag with a "See below" notation that isn't actually in the product, but that's the only big fault I can find.
The product offers an additional rules-ese addition to each background, allowing you to tweak how your class is played. The princess, for example, allows you to use your charisma score in lieu of another spellcasting stat. It's an alright feature, though not one I'll allow in my own games. I could see it really making multi-classing a bit better. But that's just me.
Each background has all the usual personality, bonds, and flaws and the like. They're fun and well-written.
Well worth the free price tag!
[4 of 5 Stars!]