Got my Laminar Lip a few months ago, just got back from a round trip of 1225 miles to Jackson, Wyoming on Monday. I'm very tall, 6'11", and this made all the difference in cleaning up the airflow to my head.
I run the stock screen in the low mounted position, this gives me good air on hot days with the screen in lowest position, and with the screen unfurled, I ride with my visor up and it works well for the long runs on the interstate. I wear ear plugs, so noise isn't the main issue, but how much or how little my head gets batted around. Still a little head pop here and there in the high postion, but for the 212 miles from Rock Springs to Laramie coming back with temps in the lower 70's, it was nigh on perfect. Kudos to the Lip.
Then when it was a monsoon from Laramie south to Palmer Lake (south of Denver) I left it all the way up and noticed that airflow didn't clean the visor too well (cause there wasn't any air hitting my visor) so I'd lower it a tad every so often and the airflow would pull the rain DOWN my visor, but created a good bit more wind noise, obviosly. This set up for me really has two postions for most riding, all up or all down. Anything in between gives more noise or more head popping.
I've put on MCL's seat riser and peg lowering kit. Feels like I'm sitting in a chair relative to anything else I've ridden.
For what it's worth, the backpressure seems to be a eliminated with the screen+ lip all the way up when I'm running with a Cortech sport tail bag on the passenger seat while riding solo.