As a light gun, the
P99K is quite accurate -- it seemed to be a tad off at the edges of the screens, but I've had similar problems with my
GunCons, and those guns are the best you can buy. It's probably more of an artifact of my aging television than any flaw of the gun itself. So, if you want to use it as a straight light gun, it's pretty much equivalent to the best there is.
It's when you get into the added features that the P99K seems to both shine and falter. For example, the foot pedal for reloads is fantastic, and made Time Crisis fun all over again for me. It made the game feel more arcade-style, and less like something I'm playing at home. This is a Good Thing.
But then you get to the recoil action. While it's cool, it's also very loud, and downright dangerous. The makers of the gun didn't put a plastic cap at the end of the gun where the recoil occurs, so there are some quite sharp plastic edges that jut out every time you fire. I almost cut my finger once, and damn near poked my eye out when I was lining a shot up in Point Blank. Legislation aside, kids are going to want to play with these guns and play with the recoil function on (cause it's 'cool'), and they can get hurt with it. This is a Bad Thing.
Another Bad Thing is the vastly sub-par instruction manual. If you already own a GunCon and know how to hook it up, there's no need, but the instructions for connecting the controller to the PSX are blatantly wrong. They're missing a few essential steps, and it would be frustrating for the first-time user that couldn't get it to work, especially those not used to seeing RCA-style plugs.
There are a few strictly mediocre issues with the P99K as well. The grip that looks rubberized is actually the same molded plastic as the rest of the gun, and can get uncomfortable with extended play. And deciphering how to use all the switches on the gun can be a hassle. These are certainly not usage-killers, though.