It "works" fine, it's just completely unintuitive and user-hostile. Tried it for a week or two, even with the cheat sheet taped to my monitor I could not build

It "works" fine, it's just completely unintuitive and user-hostile. Tried it for a week or two, even with the cheat sheet taped to my monitor I could not build an intuition for what it was going to do. I'm sure there's a reasonable-sounding explanation of how it worked (each monitor is a view of the stack-set, or some such thing) but trying to use it was intensely irritating and it never got better.