By Kirk Miller Your earbuds are worthless if they keep falling out. In my years of testing headphones and audio gear, I’ve never found a pair of earbuds that didn’t feel like they were going to slip out at an inconvenient moment, particularly when I’m exercising or running for a train/bus. Even ones that were designed for sports. UE FITS promised that issue would end. Hailing from Ultimate Ears, UE FITS uses a patented lightform technology that promises to shape their earbuds to the natural contours of your ears — and do it within 60 seconds. And all of this was DIY — no audiologist needed. I …