Good for just playing around in, quite fun to crash things into each other. The simulation is quite smooth even on my Intel GMA 3150, which btw is a piece of total and utter shit, but just don't open too big of a simulation or have a lot of entities and menus on screen or your FPS drops drastically. It does have quite a few bugs with the simulation; don't make a dice/other type of toy object too big or heavy or it will crash the simulation and you'll have to reload it. Some other bugs as well. Otherwise, it makes for a great toy to watch particle physics and whatnot.