关于Sherwood SR1 Regulator ，有谁用过吗？

Less than 0.5 joules/liter, W.O.B., at 165 fsw, 62.5 RMV
Pneumatically balanced 2nd stage
SMART Demand Lever - reacts to depressurization and relieves load on seat, extending seat life while promoting consistent regulation.
Large flexible purge cover.
One touch performance adjustment.
1st Stage
Two-piece 1st stage piston for precise optimum balance and intermediate pressure control.
Dry sealed ambient pressure chamber.
Five low pressure ports located on a 360° swivel.
Two high pressure ports.
The SR1 packs its advanced technology into a compact case which employs contemporary styling and utilizes a multitude of cutting edge materials.
The size of the SR1 control knob has also been optimized to enable easy location and operation, even for a diver wearing glove
SR1 SECOND STAGE
External adjustment for lever height.
Low profile exhaust deflector
Pneumatically balanced.
SMART Demand Lever - reacts to depressurization and relieves load on seat, extending seat life while promoting consistent regulation
Super flex hose
One touch dual function adjustment.
NITROX compatible to 40%.
1'st Stage Type Piston
LP Ports 5
HP Ports 2
Nitrox Compatible Yes
Weight [with packaging] 4.05 lb

舍伍德的东西国内很少有卖啊，不知道这款谁使用过，国内维护方便吗？