My son and his wife are visiting. My son brought his PS90 and his Five-Seven hand gun. They like to bring their weapons when they visit me because I have a pistol range on my property. I also have a chronograph and steel gongs and dueling trees. There is a Eotech clone sight on the P90. It's fun to shoot because it's hard to miss. He also brought some "cop killer" Kevlar piercing high velocity rounds and some normal rounds. We clocked the hot 5.7 rounds as fast as 2,588 fps fired from the PS90. The same rounds clocked in at 2088 when fired from his Five-Seven hand gun. My daughter-in-law brought her .45 and I was firing my 10mm Glock-29. We all traded and shot each others guns. The thing that great about the PS90 is that it's so easy to hit what your aiming at. There is almost zero recoil and I can hit the target multiple times in a row as quick as I can pull the trigger. I'm conflicted in my opinion of the weapon. Yes, my wife could use it as a home defense weapon. Because of the ease of firing it she could put multiple rounds at selected portions of a threat. My misgivings about the P90 are how the targets respond when struck. When I hit my big heavy steel gongs with 10mm they jump, spin, and ring. When I hit my dueling tree with the 10mm the paddles flip from side to side. Not, so with the 5.7 rounds. The targets would move but ever so slightly. Sparks could be seen where the 5.7 bullets hit the steel but the paddles did not flip from side to side like both my 10mm or my daughter-in-laws .45 made them do. I have a smaller dueling tree made for .22 weapons. The 5.7 rounds are capable of causing the smaller paddles on the smaller dueling tree flip from side to side. I tend to think that the reaction of the steel targets is representative of the destructive, deterrent power of the rounds. I fear that a human target would not be stopped as effectively by the 5.7 rounds as would by the larger 10mm or .45 rounds. My son argues that it matters more if the target is struck than the energy in the bullet. He points out that with the P90 all the rounds could be fired into the face, While a missed round does no good at all. I'm not sure what to think?!?!