I haven't used my 360 in a while, but will keep it until it dies! I have SOOO many games downloaded to the hard drive that I like to go back to every once in a while. Black Op's Zombies being the main reason!
I still mainly play my 360 and my main reasoning is because of 2 key things:
1. There are still a TON of games I have yet to play on 360.
2. I haven't dished out more money for another hard drive for my One, and I ran out of space super quick so I can't even play new games so I don't mess with it at the moment.
I enjoy my XB1 but that drive space doesn't get you far at all and I don't feel like playing "delete games to play other games". I'll get an external hard drive eventually but until then my 360 will still be my go-to.
I was recently given a heavily used RROD'ed Fat white Xenon 360 by my brother-in-law, and after fixing (and cleaning) it, I got into 360 games again.
I picked up Far Cry 3, Destiny and Oblivion, and I've been having an absolute blast with FC3 so far!
But boy, is this thing LOUD!
I'm definitely going to upgrade to a cheap Slim 360 or Slim One, but for now it works just fine.
Backwards compatibility doesn't support all games I want to play (Far Cry 3, for example) anyways...