Yes, I have one on my Palmer Brass.
My brother has one on his JJ.

Activating the Apex tip will lower accuracy slightly, but it's still going to perform a little better than the stock Apex barrel; plus you get all the extra distance.

You can also always turn off the Apex mode and have all of the full original benefits of the new barrel.

Either on or off, you will gain some improvement with the new barrel.

Apex on a JJ
Apex on J&J