I have owned 2 over the years - my first one was bought inb 2006 shortly after they came out.
The height of their popularity has passed, unfortunately. I once was admin of the Fn Forum, and there were some really cool accessories for them a few years ago. There still are some, but some have gone away. Also, some of the variants are no longer available.
EVerytime I get a duplicate of a gun, I end up selling one. I sold my first one a couple of years ago. With the higher Eotech and bulkiness of an aftermarket sight, it sorta took away from the point of the gun - a small, streamlined package.
I kept my 2nd one with the factory sight until last month. The smaller glass just was bugging me. I like the larger field of view on my Mepro 21 optics I have on other guns.
I also had a few thousand rounds of ammo stashed - but local supplies dried up for 2 years until just the past couple of months. I never shot the gun, because I never wanted to touch my stash.
I finally just decided to sell the gun, all accessories and all my ammo last month - and, I got another 5.56 to share ammo and mags with my SCAR 16. If I had unlimited money, I may have kept it - I really thought about it for quite some time.
But, I have a CX4 in 9mm. The PS90 was a bit more accurate - but the CX4 is about the same size. So, I let the PS90 go...