The QB trigger is a much better design. It's fully adjustable for pull weight, sear engagement, and overtravel. I've never seen one come out of the box adjusted the way I'd want to use it but it's easy enough to adjust. And if you're willing to touch up the contact surfaces, it can be very light and crisp.
Regarding the shot string, I doubt seriously it will come out of the box with a good bell curve. I just don't think there's enough profit margin at this price point to allow for any tuning. But the fact it's cock-on-open and there's a screw in the tube cap, it looks like the hammer spring is externally adjustable so it could be much easier to tune than a Disco or Maximus.