What we consider the high end are the Premium Air Tanks and air systems. The regulators perform better and give you better flow rates and consistency and they are generally user rebuildable. When you are at a tourney and your reg blows, it is nice to be able to rebuild it on the spot and keep on going. The largest differece are the materials the tanks are made from. They tanks are even lighter weight that your standard carbon fiber. Some regulators here will also give you advantages while flying on airlines. Pick what suits you best and these are that the pros use!