This is great, very impressive that they've had such success with a scrappy 2-person business. The hard part of success like this often seems to be finding an

This is great, very impressive that they've had such success with a scrappy 2-person business. The hard part of success like this often seems to be finding an under-served niche where you have, or can easily gain, some expertise. If anyone knows of a guide or has advice for how to solve that problem, I'd love to hear it.