The only benefit I can think of is getting rid of the sproing sound. It does not bother me and certainly not enough to spend that much. That's $130 that could go into a suppressor and enjoy true quiet. JP stuff is typically good quality though.
Hydraulic buffers are the ones to avoid like advanced super herpies.
Currently I run the JP Silent Captured Spring system in 2 AR15's; .223 Remington and 6.8 SPC Remington. To date, both run without a hitch thus the reason I've added one to my AR10 build.
I did head over to EBay and none are listed or at least I couldn't find any...If for some reason issues do crop up the change over is pretty easy.
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