I already had this game on Steam, but that version was close to unplayable due to lag, very jumpy framerate, and poor car handling. I installed the Gentlemen of the Row mod but it made no difference. This on a system where Bioshock 2 and Far Cry 2 play great. Rest assured that the GOG release is vastly improved. I no longer suffer from lag or jumpy framerates, and car handling is better as well. It's still not perfect by any means -- draw distance feels short, driving is not great, especially in police cars, and melee aiming is not easy. I am playing with keyboard and mouse. Overall, this is now a pretty decent open-world game, but it's still the case that Saints Row 3 looks far better, plays far better, and is funnier.