No. But it has all the hype.
A couple of years ago, the MPX was still well ahead of the AR platform, but with all the advancements and added knowledge over the years, the current top of the line AR based carbines are pretty much on par with the MPX in terms of soft shooting.
The JP5 might take away the time needed testing and playing around with parts to get a soft shooting AR running well, but the midpackers that think its going to catapult them to the top are going to be disappointed
If you have the money to spend though, why not? Still a lot cheaper than an Open gun.
If you dont mind waiting a bit, I assume that there will be other manufacturers coming out with this too, at a much lower price.
There's also the Scheel roller delayed buffer available, if you wanna play around with something now.