I don't really believe that claim about the Prismo. I don't think that it builds up enough pressure to make any significantly noticable difference. The advanta

I don't really believe that claim about the Prismo. I don't think that it builds up enough pressure to make any significantly noticable difference. The advantage of a Prismo, and why I use one, is it stops the leakage of under-brewed fluid into your cup until you start pushing on the plunger. (Otherwise, I use the inverted brewing technique.)