Got my hands on one at work a couple of months ago. Was never a fan of the removeable barrel so the F-90 system is something I like. We're getting them with a 1-6x ACOG scope which is a sweet bit of kit also. Shot a 7.62 SCAR over in the Ghan a few years back and it had the 1-6x ACOG fitted. Great kit, switching between 1x & 6x was simple and quick and I had no issue landing hits on the 800m targets with the SCAR.
Yet to do the cross over to the P90 but hopefully before the end of the year.