I was on a KSG wait list for months, then got an email several months ago informing me they had a KSG for me!! My gun is from one of the more recent shipments, so Kel Tec may have made some adjustments on the later guns, but I am not certain about this.
I've been playing with mine since I've had it. I 'grin' every time I get it out and shoot it.
I've shot probably 250 rounds, and 8-9 other buddies have tried it, they've probably shot another 200 rounds combined. Not one issue, no FTF, no FTE.
As long as one pumps the action completely back and forth, and don't short stroke the action, it feeds smooth as can be.
I've added a KSG cheek rest, I'm running an Eotech XPS 2.0 and thanks to Shooter1of38, I've just installed an Enforcer brake.
I haven't had a chance to try it with the new brake, but the cheek rest is almost a requirement, especially when it's cold. I tried a set of Troy BUIS on it first, but a RDS, in my case an Eotech, is a great way to go.
With heavy #2 field loads, 00 Buck, etc. it is a pleasure to shoot. After I installed the Eotech I decided to sight in the Eotech using slugs. Thank goodness it only took 7-8 slugs to get in sighted in! She kicks like a mule with slugs!!!
If you want a compact, 15 round, 12 ga pump, I'd highly suggest considering the KSG.
One day I'll add a Benelli M4 to my safe, but for half the price, I'll play with the KSG until I can stash some spare $$$ away for an M4.