I really like that one, but it is a bit on the spicy side for me. Just on the edge of what I can tolerate, horseradish-wise. Their mustard garlic aioli is good as well.
My favorite was one from Germany I bought at a specialty shop, can't remember the name of course. But, it did come in a little bottle that looked like a beer mug, with a soft top. :D
As a French person I can tell you Trader Joe's mustard beats all the premium mustards in this article and it is cheap too.