I considered but didn’t back the LightLead Kickstarter.
Price is not an issue. I’ve had so many instrument cables fail that I’d pay $55 for a 15″ cable if I know it is reliable. And a LightLead has advantages over a traditional cable. While I may not have experience with LightLead to know that it would be reliable, it would be something I’d be willing to take a chance on.
The biggest issue for me is batteries. I’m an amateur musician. (Well...except for that one paying gig.) As much as I might try, I don’t get a chance to play every day. When I do get a chance, I don’t want to deal with figuring out what batteries might have failed. I avoid active pick-ups. I avoid effects that can only run off batteries. I don’t want batteries in my cable. If there were some sort of “phantom power” option, then I might have considered LightLead.
(What I’m imagining as a better way to power it is a small box between the amp and the LightLead that has a power input. While this would mean running some copper alongside the fiber in the LightLead, I assume copper for power has less issues than copper for an instrument-level audio signal. The box could still isolate the circuit that powers the instrument end of the LightLead.)