I've used a couple of their other cans, and they've turned out well (although not really perfectly in style).
I've heard that the stout is good, but more of just a dark ale... not as flavorful or "thick".
If you use ONLY corn sugar, you will get a very dry, lightly flavored stout. I would use at least a bit of DME. I've used a mixture of DME and corn sugar before, as well as the package AHS sells (maltodextrin, DME, corn sugar) and they turned out well.