I recently found a used Ruger SR9 with the FDE frame and decided to add it to my 9mm striker fired pistol collection. For having a limited level of grip customization (a swappable backstrap as compared to 3 backstraps on my M&P or backstraps and grip panels like my VP9) it still have a very good feel to it. I still need to work more with the trigger as my groups weren't as good as with other designs and I also need to work with the sights. It shoots high at 25m even with the rear sight lowered as low as they will go. I figure a washer under the head of the elevation screw would work fire for this application. There is no real distinct "wall" on the trigger where the takeup ends and stiffer resistance is felt but it is lighter at 5 pounds 3 ounces average. That is on par with my VP9 and lighter than my Steyr M9-A1 and M&P9 before I put in an Apex trigger.
As far as a Canik, I can't claim to have any first hand experience. I've always been leery of Turkish made firearms and felt their quality is suspect. However, after reviewing the reviews on this pistol, I may give one a try. While a Walther PPQM1 is to be my next purchase, I am giving the TP9SA a far more serious look. The trigger is said to be excellent and the quality is proving to be far better than I expected.
The design I believe has a flaw in that depressing the decocking plate will leave you with a dead trigger. I know some have said its almost impossible to depress it without intending to but "almost" isn't a guarantee against it happening. I have heard that because the Turks carry their sidearms in condition 3, this is what is behind the decocker. Weapon is pulled, slide is racked and shots are fired. Before returning it to a holster, the decocking plate is depressed, dropping the striker and in a way, you are back to condition 3 but with a round in the chamber. That's just one theory I've heard but it's a plausible one. However, I don't like it. It is easy to deactivate that feature though by cutting down a wire hanger to be just slightly longer than 1/2 the length of the springs and put them inside the decocking plate return springs thereby preventing the decocking plate from being depressed. Problem solved.
The other thing about the Canik that gives me pause is that it's imported by Century Arms. While spare magazines are available, what about spare parts like say a striker or a trigger return spring for example? Other items like holsters can be an issue to some extent as well as any other aftermarket support. This may change if this pistol increases in popularity but for now, that's pretty scarce.