Better have a pretty decent computer. The game can be laggy. Tried it on my p4 1.8ghz with 65mb nvidia video card with 512 ram and could barely move. Now playing on amd athilon ~2 ghz with 1gb ram and 128 mb nvidia. Still laggy but no large "pauses" in the game.
Besides that, I am very pleased with the game and have been playing for about a month.