This is exactly like the hop ups used in CA SCAR, ICS M4, and G36, and some other V3 guns.
These types of hop up are very consistent, providing higher shot to shot consistency/accuracy compared to traditional M4 hop up units. This applies especially if you fire it in full auto.
Very good idea on madbull's side. Now I just hope that they don't fuck up the QC and all the parts fit loosely(which will have significant negative effects on your accuracy).