If you think a knife must be full tang to be useful, you are wrong. There are many knives w/o a full tang. A partial tang is often what makes a blade more useful since it allows a different balance point and a more ergonomic handle. It's pretty easy to slap a few slabs around a blade, it takes more skill and design knowledge to make a partial tang knife. People w/o that skill perpetuate the myth that partial tang=inferior blade.
Bill Moran was a master smith and a knife design genius. Trust him, spyderco, and all thouse years of production. I've never heard a single complaint about the Moran (except for the switch to kydex sheath). I am sure if the partial tang was a problem it would have been outed by now.