i got it in the very beggining. i love that it's tracked my progress since the begining. (march) but i hardly use it anymore. i really expected more in the cardio section. i still use free run. that's the most intense w/o. but i hate that my cals burned must be completely wrong. they always say it's way low.
it does have challenging core work, like the jack knives and some challenges against the trainer. i really wish there was a squats challenge.