I ran the Wunderlich screen for a few months and found it a 100% improvement over the standard screen. I then decided to try a set of Tobinators and found they improved it again (it's getting the airflow under the screen that counts).
Took about 10-minutes to set up and have been happily using it for about 18-months (yes, check the clearance but as long as you allow for this it will be ok).