CZman

I recently provided a brief comparison between the ZGDB and the stock screen. Here's a comparison between the ZGDB and MAR's very good Vario screen.
(Here are my specs, because they make a pretty big impact on the experience: 5'9", long torso, 170lbs, Gen Mar 19mm risers, stock seat, 6mm shims in rear shock, rear shock preload adjusted about 3/8" (threads showing under spanner nut) from full squish.

The stock screen put wind a few inches below my chin and allowed the best wind against my shoulders and head to reduce lean fatigue on wrists, shoulders, etc. The ZG keeps wind resistance on my shoulders, but lifts it up to my face, which seems to increase high frequency turbulance under some conditions, but not all. Both of these screens expose my head to any existing dirty air, which results in my head moving left and right. In clean air, the ZG seems to work best when riding at higher speeds and for longer distances, meaning that the air is distributed such that I experience less fatigue.

The MRA Vario screen: Twisted Throttle's service is great. However, I should say that it is priced about $30 too high, IMO. The fit at the two top mounting screws is not great, but I was able to create my own spacers to make it work. The finish is very good, and the hardward MRA uses to mount the adjustable portion to the fixed portion of the screen is excellent. I chose the dark smoke color. It looks very nice. The screen sits low enough so that I am never looking through it, but over it, as with the others.

The effect of the MRA is noticable immediately. At the lowest position, it feels almost identical to the ZG. At second-to-highest position, it does an outstanding job of cleaning up the air around the entire upper half of my body, with high speed air just sliding over the top of my helmet when riding between 70-100mph.

There is less air hitting my shoulders, which means that there is slightly more weight on my wrists. There is a lot less air hitting my head. The sound of the passing air is different as well. Instead of the high pitched woooosh, it sounds as though I am riding through a tunnel. The pitch seems lower, and it never goes away. If you are looking for quiet, then this may not do it for you. But with good ear plugs, it is pretty comfortable.

I can tuck beneath the air flow almost completely, which is not someting I could do with the other screens.

The best thing about the MRA is that the air, virtually all of it, is cleaned up at any speed. All buffeting and back and forth head wobbling are gone. This is true even when I leaned my head to the right or left during cornering. I think that's pretty amazing, considering the relatively small size of the screen. This suggests that MRA did their homework.

The faster I rode, the better the MRA performed, as though it was designed to go really fast. Because the air is so clean at high speeds, it decreases the sensation of speed, which may be a bad thing for you types who have little self-control. 90mph feels like 70mph.

Overall, the screen is somewhat expensive, but very well designed and effective. It is very well built. It does not eliminate air, but it does a very nice job of cleaning it up, and gets better the faster you go. I am never quite sure what "touring" is supposed to signify. I don't think the MRA is going to transform a long day in the saddle. But if you want adjustability, clean air, and a screen that is good for any kind of riding, then the MRA is a fine choice.

Toynut

I have tried all of the above screens and was impressed with the MRA Vario (aesthetically detracting, though).
For highway speeds (and above), I found that the GIVI touring shield to be the quietest (still using ear protection), while providing relatively clean air at high speeds. I'm 6'0" with Helis, Corbin seat, and rear Penske shock assembly in the 6 mm shim height raised position.

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Al
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Momma always said "the best things in life are free"! OK,sure.............
Then again, Momma never rode a motorcycle, either!