I picked it up last night when it had finally dropped to $20 at Target. All I can say is I'm glad I didn't pay more. In addition to installing SecuROM, the game requires that you install Games for Windows - LIVE and Rockstar Social Club, and sign on in order to save your progress at all. If you aren't logged in you can't save. Beyond that, it's probably the worst looking game I've seen in five years. In fact it has the distinction of being exceeded in graphical ugliness only by it's GTA predecessors. I really can't remember seeing so many jagged, pixelated edges since the 90's ended.
I just started last night, so I can't speak much to the gameplay yet, but it seems identical to the earlier versions. I have no doubt your system will run it well, since it is doing none of the GPU-intensive stuff that makes rendered images look better (except bloom lighting, which is splashed all over everything to such an extent that I sometimes think an atomic weapon has gone off behind me).
Seriously, if you can get it for free, it might be worth the cost.