HI Kirby,
In Australia we have very few good commercial canoes - unlike the USA and Canada where some of the commercial boats are very fine indeed.
So in Australia I would say the Eureka is a less stable than the normal fibreglass bathtub of a canoe but paddles really nicely in all conditions in comparison.
In the USA I would guess that if you have paddled a few different canoes it is very likely you have paddled some very good ones and know how the range of stability between boats will vary a great deal.
That said two experienced canoeists built and used the Eureka and called it "stable" and reasonably fast.
I quote them on this page
Eureka Lightweight Plywood Canoes - more pictures and review - Michael Storer Boat Design
In comparison people who have not used canoes before might find the Eureka a bit tippy when they first get in, but after getting used to it find it quite stable.
One factor is I have designed it around 340lbs of people and a very light weekend away kit. This might make a bit of difference too.
Best wishes
Michael