Amazing games. I still think the 3DS version is better, since the 3D effect worked particularly well there, but it's pretty much as good here. The only new feature I know of is that the melee character from the second game is now in the first, so that's cool. It would've been better if there was vibration support, since Gunman Clive is a very vibrationy game.
Yet still they are amazing games to play so it's definitely worthwhile. And they're replayable enough to be worth getting for one's primary console.