You can get quite a selection, though sometimes you do have to poke through a lot to find something good. If you're looking for teen brands, particularly some of the cheaper brand names, you've found the right place.
Price-wise, it's not that much better of a deal than some of the mass-market warehouse-type retailers. If you're a good shopper, you can find great deals at those kinds of places. You can argue whether the clothes there are any better or worse. But also, you also don't get very much back from clothes you sell to Plato's, may want to look around a bit more.
Definitely a place to check at least once, but it's like any other store: still need look around for the best outfit, best fit, best price.