I have a half windshield and am planning on getting the full window for the back, I hope that will keep more dust away from the interior of the machine. But likely dust will come in below the doors, so I may have to get the lower door inserts too!
I live and ride in NM and the dust is horrible. One short ride and you're covered in dust. Then I put a rear window in and removed the front windshield, it was amazing the dust was almost gone. I've been riding with the rear window installed and I find it much more enjoyable when your not sucking down a bunch of dust all the time. Note; this is riding with no one in front of you and at enough speed to get a little air flow.
Much less dust on the rear seat (and passengers when we have them) with the rear window installed. Got it from SuperATV and it works well. We have a 1/4 front windshield so it blows thru and seems to help keep the dust out.
(see video below) If you install a front windshield, you will probably notice dust coming in from behind and around the vehicle. I have found the inside of my windshield dirtier than the outside. It was bad when I had my Polaris 1000RZR; even worse with my Honda Talon. Some people combat this by...