I have the X-Ray and have found that it's a little too nice for use as a utility knife. It's a great looking knife. I would hate to mess it up hacking up stuff at work. I have also found that it's a bit on the large side for use at work. Some folks flip out when they see a blade over 3 inches long. I use my little Spyderco standard at work most of the time. If I have to do a lot of heavy cutting, I'll drag the old Sog AutoCLip out of my tool box.
When we head out for a walk or a trip to the mall, I always carry the X-Ray. It has the fastest opening blade I've ever seen.
I have used it to open a few boxes and cut some ski rope while out shopping, and it works just fine..