Is anybody shooting any of the 5.7x28 handguns?  Should I want one?  Or, is it just that it's new and unusual that makes want it?

OK . . . How about opinions from people who HAVEN"T tried them . . . It's not like this forum to not have an opinion!

Ammo is expensive, and kind of hard to find. 

It’s not a new cartridge. It’s been around for a while - developed in late 80’s. Put in service in 1990 by a few militaries/agencies.

As a plinking cartridge it’s fun and shoots flat, but it’s expensive and hard to find.

As a defensive cartridge, it’s trash. Lots of better options out there.

Haven't shot the Ruger, have shot the FN, Fun to shoot, not a must have,

But if I was able to get one cheap I would.

Ruger 57 is pretty nice.  Flat shooter.  FN Five-seveN is actually kinda finicky from what I've seen/read.

I own both the Fn Pistol and the PS90. I enjoy both. Ammo is tough to find & expensive. Cheapest I've seen it lately is a dollar a round. Mostly FN & American Eagle. you can go thru ammo quite quickly..

Thanks gang . . . I hadn't looked at ammo yet (Can't tell you why!) but you have slacked my interest some . . . 

I am to the understanding that the FN ammo is the stuff to buy. American Eagle I am told is loaded light. 
 

Experts can chime in on that.