I've spent a number of years developing them, and tried them with a spread of businesses; tech startups, small e-commerce businesses, mentors, and even teams at hack events.
Everyone I've played them with got something good out of the session - an hour with the cards was enough to give completely new ideas for potential direction, help the team gel together, and give inspiration to a lone-wolf founder.
The idea is battle tested. I need to select the best from my prototype deck (which has 70+ cards) and finalise language, but they're sharp tools. Even if you think you're settled, Kick Cards will give you other ideas to play with, and - at least - cement your confidence.
Many of my early backers were people who have seen and played the prototype deck- so I'm sure once you try them, you'll love them!
In the unlikely event that you struggle to get the deck working, I'm most happy to have a Skype call to get you moving. I don't want anyone left behind =)