I think the Walther P99 is one of the best striker fired pistols ever and the S&W versions of it are as well. In fact S&W's Lifetime Service Policy was eventually adopted by Walther but raised to be a Lifetime Warranty.
The P99 is one of the very few striker fired pistols with repeat strike capability as consequence of its DA/SA design. Decocking puts the gun in double action mode. The trigger reset is very short and it's an accurate shooting pistol.
Here's a S&W .45 Caliber version of the P99: