I have one with a 6" barrel. It is an accurate gun that is easy to clean, and a lot of fun to shoot. The front sight is a little wide (I swapped out the front black sight for a red one) but that is the only down side that I have found with it. Only other thing I can say is that the grip is a bit on the small side, so if you have big hands be forewarned.
At one time the Neos was also made with an even longer (8"?) barrel.
Don't know why it was discontinued, but I bet it was really muzzle heavy.
Gumby