I got 2 bricks plus about half a brick in individual purchases so far. I have 34/40 from just this many (one of my missing minis is a common skeleton, and 2 are the uncommon elf wizard and snake), so the distribution is pretty good. I have not had one single mini be broken or off the base yet, but several were not securely held in their plastic cradle. I feel these are potentially more brittle than the DDMs, however, but I've yet to let my 4 year old really test that. I will note, however, that the hardness can vary within a single mini. Namely, the body of a mini is stiff, but the sword (which is NOT a separate piece) is flexible, so less chance of weapons snapping off through use.
The scale problems of the dire rat, troll and gnome are notable, but not as bad as some other prepainted minis initial releases. The people complaining about the sizes are comparing to DDM, which isn't really fair. These minis are designed around Paizo's illustrations and sizes, so as long as the sets are internally consistant, they should be ok. And that's the problem with the dire rat and troll. But Paizo has admitted the error for these and will correct them in future sets.
The "pc" figures are pretty good for prepaints, but not as good as the iconics from the previous release. Really, those first 4 set a pretty high bar, and the paladin is the only one of mine to come close. But the detail on some others is pretty remarkable, like the colored eyes on the medusa's big pet snake, or the beard and facial expression on the human ranger. The paladin has her holy symbol on her shield, and the goblins are downright awesome for prepainted minis.
In a week or two, I'll try adding some inks or a dip and see how well that improves the base paintjobs. If it is any improvement at all, it's a super-simple step that can produce a huge change in the quality of appearance in these minis.