Overall the quality is very good. My bag didn't have any obvious flaws in any of the dice. All of the dice were well-marked and very readable, though the pearlescent white dice with the gold lettering might be a bit more difficult to read under some lighting conditions. (They are really pretty, though.)
There's a nice mix of colors here - whites, reds, yellows, greens, blues, purples, brown and blacks. There were no orange dice in my bag, but that's where these sets can be random, as others have received orange dice in their bags. The marbled light-green and marbled black sets are probably my favorites.
Over a third of the sets in my bag were translucent, with the remainder being opaque solids or marbleized opaques. I'm not too keen on brown dice, but they aren't bad -- and the rest of the dice are in colors and patterns that look really nice.
The small Wiz Dice logo bag is nice. As others have noted, it can comfortably hold 2 standard sets of RPG dice. The dice in my small bag were black with white marbling, duplicating one of the other sets in the larger bag.
I'm very pleased with this purchase. I've also recently bought the Chessex Pound-O-Dice and the 100 Pack of Polyhedral Dice by White Tower . Of the three sets, this one yielded not only the most dice, but the most sets and the greatest variety of sets. (The Chessex Pound-O-Dice had more overall variety, but I couldn't even get ONE complete set of dice in a consistent color out of it.)
Of the three, this is the bag of bulk dice that most people are looking for.