I've have and use a P67 that I bought new about ten years ago. I have the 55, 105, and 200mm lenses. I've run countless rolls of film through it with great success, but I've never used it handheld, nor would I ever choose to! One of the best features of this system is the mirror lock-up, which, when the body is used on a tripod, helps keep the negs as sharp as possible. But, to actually use it like a 35mm camera without the pod would put sharp negs at serious risk because of some pretty significant mirror slap.
Having several systems is a really good idea when your shooting styles vary a good deal. For your "around my shoulder" X-country skiing moments, stick with the 35mm.