I too have a 17' Grumann canoe, and pretty much what everyone here has said true; they are tippy, they are hot, they are heavy. For inspection purposes take note of the inside ribs for cracks, as this will cause even more instability. I will say this, once you get the hang of one they are great, I personaly love mine.
Operation "Save Rudy" Strike Team (charter member)
Yes, I am still working on it.