I'm an ardent supporter of this weapon as being both a great weapon generally and a good CCW for my build (5'10" - overweight). Since my purchase, I've carried it almost daily and have been satisfied that I can carry this in shorts and a polo shirt without much issue because it is a super flat gun for the caliber.
With the default 6 round magazine, most shooters should be able to get all of their fingers on the grip, with the dangling pinky an annoyance of mine regarding weapons that go much smaller than the Walther PPS.
While the weapon has a slight blockiness to it, the grip ergonomics are almost as good as my H&K P30 .40 Caliber. As noted, the backstrap is also interchangeable if you want it to fit in a larger grip.
Incidentally, while this weapon has the typical striker fired, drop-safety only system a'la Glock, you can completely safe the weapon by removing the backstrap, which decocks the striker and makes it impossible to fire. While some look at this as a potential failure point as the backstrap could somehow fall off in a crisis situation, as a parent, I appreciate the option of being able to easily and completely safe the weapon.
At this point, I've put about 250 rounds through it, and I've got to say that again using my H&K P30 as a bench mark, that this weapon's felt recoil for me was the same, so the spring system is very well designed for the felt recoil to be the same when the Walther is significantly smaller.
I'm also making 8" groups just plinking around at the 15 yard line, so the accuracy is just as good as my full size pistols as well.