So I hit my name for a 6.........again. I got the iClear 30S with my MVP and have just been attaching it as is. I found the draw and vapor production quite bad. This weekend I discovered the silver collar thingy in the MVP's box. Picture below. Well, well. The iClear now out performs the MPT3 by miles! I see the collar has 2 air holes whereas using it without the collar it was just drawing way too much air. I know the iClear is not getting great ratings from forum members, but for me it is perfect. I can't say the same about the MPT3. I guess I still have to learn how to use it properly.