Because it's a smaller screen, they'll look better than they did on the PSOne, but it's not really because of any emulation upscaling or anything.

At $10 a pop, they're totally worth having. You can play them at home on your PS3, then take the same save file with you on the go with your PSP. That's actually a moment I waited for in gaming and here it is! With some of the best games of all time! Enjoy!