We finally tried a jar of the home canned butter and it was actually pretty good. It was missing something and I'd have to say that it is the salt since I canned the unsalted butter. It was creamy just like stick butter.
I used a double boiler to melt my butter, I've heard tales of it being gritty but they didn't have a double boiler which leaves me to believe heat is the culprit. Shelf life is about 3 years, I'd say that's stretching it a bit, more like a year and a half to two years. Ours won't last that long so it's not a problem.