The Original Pgp's are workhorses. They are simple and can be really effective in SC play, however they are dated and need a few things to be worthwhile to the average player.
1)Rear Velocity adjuster
2)better feed setup
3)better 12gram knob
The New Version does a good job of addressing these issues though they could have done better with the feed.
The longer barrel is "gravy" and adds a touch a menace to the "look" of the marker.
Now with a little attention to the feed, I think the new version is better out of the box.