I've had a number of 2nd and 3rd gen 17s, all of which are have been sold off since I tried my first 19. Nothing wrong with the 17, but I just liked the feel and the compactness of the 19, even with the restricted barrel.
The only real downsides to the 19s are that they seem, to me, to be a bit more snappy than the 17s, and are more expensive.