Product looks great (the 3D renders at least), and I could see my prototyping bench with some of these on it. Would look and function pretty nicely. But it would just be for vanity more than anything. Right now we use R&C books, and well organised box of component bags and reels for prototypes.
Hopefully you can mass manufacturer these so the price per is low enough to make it a good value proposition.
Don't forget, we all have 3D printers of our own, a Maker would easily clone this within a few hours. The cost to print a few dozen is not that much. For makers, it is just convince and time you are selling.
Maybe if you do a large enough package, SMEs might buy into it?
Will have to wait and see what pricing you can come up with.