Way before the Apple Watch came out I had a bulky Garmin GPS watch. I thought it was the greatest thing not to have to fumble with my phone to check my running stats.
If I were still a runner, I would buy an Apple Watch in a heartbeat especially now that it has cellular. Heck I would buy it if I still went to the gym (as opposed to having my home gym) just so I could leave my phone in the car.