I had the Nike+ watch for a few years which promised a lot but didn't really deliver. I've just swapped it for a Sony Smartwatch 3 which runs a standalone Runkeeper app so you don't need to take your smartphone out with you (it's the only smartwatch, as far as I am aware, that has it's own built-in GPS). It also stores about 5GB of music.
It's early days for it so far but I haven't had any issues and it's also a very fancy gadget if, like me, you like that sort of thing.
Just signed up for this. Not run a race for over a year due to on / off injury and health problems. Have kept up the running throughout but it has been sporadic. I hope this will be the event which gets me back where I want to be.
I also have a place in this event which I don't want. I got talked into entering without realising what it was and now I've bothered checking I don't want to do it. If you want to do it then you can have my place for free as they don't do refunds.