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If there was a way for me to load 5.7x28 on a progressive press (the primer exit hole on most presses is almost as large as the 5.7's case head), I'd be all over the PS90.
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You're in luck, there is. I reload 5.7 on a Dillon 550. It costs a little more than other calibers to tool up for, but since the ammo tends to be ridiculously overpriced, the savings are pretty massive if you shoot much. The shell holder was about $80, as I recall, as Dillon won't support the caliber and last time I checked there was one guy that made them... but dies were easy to find, and my loads have worked well.
I have a mini-uzi, and a PS90 SBR. The PS90 is shorter (when shooting from the shoulder, obviously). While I'm not a huge fan of 5.7 as a caliber, the gun is pretty cool, and you'd be hard pressed to find something shorter, lighter, or easier to shoot.