I use it for the lolz. I don't chase koms because there is no real reason to (except in the off season when im bored). I use it to stay in touch with some people i don't get to see very often, and to give others ****.
For training purposes it sucks, and you can get GC for free (does everything plus a billion other things you'll never need), or wko+ or cyclist analyst (or what ever its called) for a small one time fee.