That Beretta Neos is just another trip to the well for the old High Standard Duramatic design. It never worked awfully well for H-S, then Colt used it in their Colt 22 with little success, so now Beretta will have a crack at doing it with pizza and polymer.
The major problem is maintaining the proper balance between the recoil spring and the striker spring. Otherwise, the design is not bad.
Jim