I have a HAK utility.
I think it's a great little knife, mainly because it's small enough to be invisible, but still has enough blade to be useful. I keep it in my pocket for opening boxes etc. For SD applications a slash from one would hurt - a lot.
As for the service, I have no complaints. I only bought mine 6 months ago but it arrived quickly. They included an additional sheeth after I ordered the wrong one. The handle fits my fingers perfectly, and the extra goodies (paracord, band-aid etc) are a nice touch.
Their online shopping website is horrible though.