I am curious, for those of you who have smart trainers, what apps and electronics are you using with them? I picked up a Wahoo Kickr earlier this year, and while I have played with the Wahoo app a bit, I'd like to get into something like Zwift or similar. Is it worth the $15 a month? Is there a cheaper/free alternative that works well? Any recommendations on which one/how to rig up a tablet to control it and display the app?