I'd have to add my vote for the PF3 or the Plexistar 2.
If you do "commute" on your bike with highway riding, it just makes sence to get the most protection. Be it from wind , rain , hail, road debris or the occasional rock tossed at you by a car or truck. You also extend your season as you can ride when the temps go into the 50's or 40's as the screen does a good job of keeping the blast off you when it is cold.
As for when it is hot out, do remember that any shield does not cut you off from airflow fully, and as long as you are moving there is always air moving around you. The design of the Vulcan also seems to always let wind hitting your legs rise up your torso some even with a large windscreen. The only time I tend to feel hot is when I am not moving , where having a windscreen at all or one thats big or small would make no difference anyway.
I have never heard of PF3 or PS2 cracking as Gatecity reported. Most times cracking is the result of using some kind of chemical on the screen you shouldn't have, or from some type of impact. Or from someone trying to modify the screen by cutting it and not finishing it properly.
Acrylic screens are pretty tough. They still use them on aircraft. The problem with using the much stronger plastic , Lexan, is that it scratches easily. National Cycle does sell Lexan screens, but they have a scratch resistant coating on them...and cost alot more than acrylic.
I had mine for almost five years, and bought it used , so not sure how old it was. (I had the PS2 also, which I think fits the Vulcan a bit better than the PF3) If you are 6'2" both NC windscreens should work well for you right out of the box. Us short guys usualy cut ours down some. Both also can be taken off quickly if you feel the need to have your body blasted by the air.