Remember that you are shooting a new gun that is not "broken in" yet: meaning, stiff gritty, trigger, stiff recoil spring, stiff magazine spring, and so forth.
If your local gun range rents SD's, rent one and fire it. It will feel entirely different from your new gun. Everything has been loosened up and it should make firing, ejecting, reloading, and repeating a lot easier.
I can only speak for the trigger and cocking the slide. I just bought a SD9 but I'm having second thoughts about keeping it. I haven't done anything to it, but the feel of it seems like a totally different gun than the rental I handled at the range.
Unfortunately, the range will not allow newbies to rent guns without having someone who knows me be there, so I did not get a chance to shoot it.
The basis for my choice was cost ($300) and the subjective feel of the used gun I dry fired.
Part of the problem now is that I've had a chance to sample and fire five different guns - 3 semis and two revolvers - and I liked the feel and operation of the wheel guns better than the split trigger semis that felt like hair triggers to me when staged in SA mode.
I've used S&W revolvers before, so I'm used to the feel of a double action revolver - which was one of the reasons why the DAO on the SD9 VE was not an issue for me.
The extra capacity was the other reason for choosing a semi over a revolver. But, I think I'd be better off having something I feel more comfortable and confident to shoot. I bought it for home defense and I had no problems firing the .357 mag & .38 Sp +P rounds.
I got mine at Academy and since they don't take back firearms, I am serious about selling it.
Any thoughts?