I was first interested in this as I was buying my Christmas present for myself for a tactical/HD shotgun but I didn't want to wait. So I went ahead and got a mossberg 930spx with pistol grip, 8 round auto loader. Bought from BANG few days before Christmas and got it the next day. Attached aftermarket rail and light, sling and a shell holder on side of action and it makes a great HD gun!
The KSG still interests me to some degree with the sheer compactness of it and even higher capacity, but just didn't want to wait and then maybe have to overpay for it. I'll be interested to see how it does.