Further review:

The ice pinch is my favorite slide ever. no buds pull through and it has very little drag.

i have decided to give the diffuser to a friend. It fits better in his roor and I like my roor.us diffuser more. all my friends agreed that the same style with bigger slits would be awesome. for some reason the new diffuser was really unreliable though and was giving my friends and I really harsh hits that were impossible to clear, but sometimes it worked really well.