5.7x28 ??
Are you talking about FN's 5.7x28 USG pistol? If so then it's not a bad pistol I would say. They're reliable, extremely accurate, super high capacity, almost no recoil, available this year with Trijicon night sights, spaceguns. I say spacegun because the only downside to it is it's looks and the fact that ammo for it can be scarce. You won't find ammo for it at Wal-Mart, but I don't think anyone expects to anyway. Expensive gun for a novelty piece in my opinion, but definitely an oddball weapon.