I just bought one of these:
https://www.sidebysidestuff.com/motoroof-wind-jammer-rear-panel-cf-moto-zforce-500-800-800ex-1000.html

I chose this option because:
1) I have too many mods attached to the back rollcage for acrylic/lexan rear windshield to be an option
2) It will not scratch like acrylic or clear vinyl
3) It will allow more airflow through the cab(compared to solid acrylic/vinyl) to help mitigate the heat from the engine(especially during summer months)
4) It is SUPER easy and fast install/ removal
5) They claim it should greatly reduce "blowback dirt' sucked into the cab with my front flip windshield closed
6) VERY reasonable price compared to acrylic and clear vinyl options

Does anyone on this forum have one of these installed? Do you like it? Does it seem to work well (reducing dirt blowback from the suction vortex created with a Front windshield)?

[2015 Z Force 800 53/Trail EPS]

I know some in our ride group that have them. They do slow down the vortex rotation and cab dust.

Cool! That is reassuring to hear! Thanks NMK! 

Looks good I'm ordering one

Very cool.  I'd be curious to get a good review after you've had some time with it.  I currently have the lexan, but it's not the scratch resistant one, and it looks pretty rough already.

I will report back once I get it installed and have a chance to test it out.