ECR is a very capable bike, but can be a bit limited if youre doing super technical stuff because of the low BB and long wheelbase. if youre an advanced MTBer youll be fine but it will be a bit of a struggle if youre just getting into it.
that being said if youre strong enough and have enough willpower to hurt yourself it will take you anywhere, mine is SS and i kept up with the scott scale XC bike just fine.

it is definitely the most comfortable bike ive ever ridden though, its like a cadillac