Simply the best free pistol, not decision you will regret. If the picture is your gun, you have the long compensator, not sure why you would also want a weight as well as the compensator hanging out front.
Get a spare battery on fleabay, will probably need to come from Germany so takes a couple of days. The gun does not auto off if you leave it switched on, so battery will flatten. And you will leave it switched on by accident sometime, so get a spare battery before you need it.
Don't set the trigger too light, easy to set it to 30 grams and it will punish you, better set it so there is positive feel, start no lighter than 100g or so. Also it is tempting to maximise the sight radius, but shortening it can help.
Mine does not consistently eject some brass, eley is fine, cci standard velocity is as cheap as chips and is fine. Mine has a diet of hideously expensive ammo simply cos that's what I have. So find an ammo that suits you and gives you confidence.
Lastly, many are modified to a single rod rather than the star trek enterprise look. This only saves a few grams, but for some reason feels nicer to shoot.
Enjoy.