Pretty simple, just ask to look at their portfolio or speak with clients that they've helped. You're right be cautious in your approach. If you're still looking, let me know, I work with a great team that has design, engineering and manufacturing. It's an end to end solution.
So Crowdfunding is all the rage and Kickstarter seems to be a great way to validate your idea, but that being said, how can I truly know if Kickstarter is the right demographic for my product idea? I mean, what if it's a bunch of gadget folks that don't understand the value of something outside of the tech market or if it's just a bad idea all together? Crowdfunding has changed the game.