I have an ICS with the overarm collector with the original fitting (I will have to look to see if it's 45 degrees or 90). I have it connected to a Penn State 1.5hp dust collector. I find it it very effective depending on what I'm doing. I'm not sure anything captures MDF dust.
I do find dust on the table. I also find it in the gap between the fence rail and table. I seldom sweep dust from in front of the saw. I seldom see dust on my apron. I have an air purifier but don't need it often and never because of the saw.
Does that help?