Things I liked: nice inexpensive GBB pistol that you can shot with right out of the box, except that you need to buy some 12gram co2 cartridges, which can be found at almost any big box or sporting goods store. nice weight, balance and comfortable grip With a fresh co2 cartridge, the measured fps was from 340-360fps on .20gm bb's Grouping at approx 20~25 feet is fairly tight (about 3 inch box) co2 cartridges are cheap, easy to find, and last at least 10 clips before the slide will not lock back when the clip is empty. But, you can still keep on firing, the slide will still blow back with less recoil, fps will be slightly lower. Performance will drop of noticeably after 15~20 clips.
Things I would have changed: Adjustable hop up adjustable iron sights better mfg tolerances for the mag clip and slide, a bit too much side to side play. Also, weird rattle behind the safety. Quality control may not be the best when loading the bb's have a tendency to fall out of the hole in the middle of the magazine. Instructions to include disassembly
What others should know: not too many holsters for P99 double action trigger takes some getting used to great gun for CQB
Things I liked: Easy to load with speedloader at the top Solid metal construction
Things I would have changed: When loading with the speedloader, you need to keep one finger on the hole near the bottom to keep the bb's from falling out. Higher capacity, at least 20 rounds Doesn't fit into ammo pouches snuggly because of the slim design.