5/14 Cherry Berry Chiller

We never eat at Micky D's because my son has a soy allergy and well, soy is hidden in all sorts of places, so it's just best to avoid the Golden Arches.
But, alas, I was not with my son and I admit I am a sucker for anything touted as "new" -
So here it is the "new" Cherry Berry Chiller - 

If you pay for a medium do they fill it all the way up??

It is more fruit juicy than a slurpee, but I'm going to go ahead and stick with slurpees. 
Ever get less than you ordered or hoped for?