I have the the BG-X and the Balance 2.0. The BG-X feels tad firmer initially but you do sink down a bit; if your side sleeper not as supportive in my view; similar to the 2.0 (very soft and fluffy like, KINDA supportive.  THE BG-X is a 'decent' all around pillow but not completely impressed all things considered.  The BG-X is 'cool' and is a really good stomach pillow and can initially be a good back pillow as well (if you scrunch it up). but overall it's average in my view and at best.  I'm 5'7" @ 170lbs. for sake of body comparison vs. pillow.