I purchased this along with a load of the dungeon tiles from 0one games to use in my running D&D 3e campaign. If you're looking for a summary, I'd say this product is worth buying if you're specifically looking for this sort of thing. Which, if you're looking at it (or this review), you probably are looking specifically for a cheap mini's product.
I print all of my stuff out on an old HP LaserJet III, which is terrible with graphics. So this review has more to do with what the mini's look like in the PDF. Though printing concerns will factor in, as you'll see.
The art is better than I expected. I had to pull out some of the more risque mini's when playing with my kids, but that was no big deal. There aren't that many. I like the inclusion of mini's in both black and white and color, especially with my limited printing options.
The layout could (and should) be better. Blocks of mini's are scattered across several pages at random. If not for this, I would have had a set of these professionally printed. But since they use up twice as many pages as they should, it would be more expensive than it's worth to have Kinkos run off a batch.
Still, it's far better than buying, storing, and painting metal mini's and I like this product significantly more than Steve Jackson's Cardboard Heroes line - partly because of cost. If a few of these get destroyed, so be it. I print off another sheet.
If I ever get around to get some professionally printed, I'll comment on this review to let everyone know what they look like. But I've zoomed in and inspected the art in PDF form and they look like they'll be excellent when printed from a high end printer. I would guess any printer in the LaserJet 4550 / 4600 line or above would turn out remarkably excellent Disposable Heroes.