If you want a touch monitor for your desktop PC, this is the cheapest option we've seen, and in that light this isn't a bad screen as long you're aware of its limitations. It could even be a fun project for modding or home automation. For this price you won't find any smaller touchscreens either, and most others cost at least twice as much.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips