I had one of the original versions in .40 S&W that used the G22 mags (some used S&W mags, IIRC).
I sold it to use the funds to build an AR pistol, but I wish that I had kept it (nothing against the AR pistol, I just always regret getting rid of the few guns I've ever got rid of).
I think the newer models are better because of more custom options for sights and such.