I switched to Glide, a vendor-focused package manager, on 1.5. I think the community has already decided in favor of this approach. Post 1.5, Godeps' workflow just feels weird and unnecessary.
Use godep everywhere. It supports the vendor folder, and I find it's still a great solution (and saves me using submodules).
it is, and works well enough for individuals, but doesn't make for the friendliest ecosystem.