[dayman]

It's actually only 11 with the spare mag. 5+5+1. You can get bigger mags - 7 rounds I think, but I'm okay with the 5.
The advantage - at least in my mind - over the G26 is the width. It's surprising what a small difference on paper can feel like tucked into the back of your pants. With my personal style of dress, the width of my CC tends to be the dimension than either makes or breaks it.
The advantage over a revolver is the weight (at least over my sp101), and also the speed that I can reload. I carry the .357 in the woods, but for town the XDs works better for me.

I actually heard about PRP here - on another post about someones new XDS. One gun forum is all I have time to handle. I'm not usually big on changing much on my carry gun other than sights, but they had such universally good reviews I decided to go for it. I didn't actually notice a whole lot of a difference, but it was enough that my groups tightened up a little.