General perspective note on Interstate screens in general.
Yes, the need does depend quite a bit on where and how you camp, and also when (what time of year). Biting insects have been one of our two biggest challenges on our current trip (the other has been the lack of propane supply which is described in this On The Road thread
I have spent considerable time and effort designing a custom bug screen for our 2007 Interstate. However, the whole idea of bug screens runs somewhat contrary to nature in the area where we currently are. Here are some Great Truths of Life for contemplation:
(1) The sun rises in the east.
(2) Bears defecate in the woods.
(3) The Canadian wilderness is overrun with biting insects.
No matter how good or expensive your Interstate screens, in an area like where we are, the problem is not keeping them out via screens - the problem is that every time the dog is let out to pee, at least 20 mosquitoes follow the dog back into the Interstate. Which then causes my husband to lose his mind and go on an obsessive interior kill-a-thon. Like, every single time. When we get back home, I'm going to have to wash every single interior surface of the Interstate to remove the blood and insect guts that are now everywhere.
In other words, the real problem in an insect-rich environment is not keeping insects out with effective screens. The real problem is the minor catastrophe that occurs each and every time people and animals must enter and exit the vehicle.
Therefore, why spend thousands on screens?! Better to go lower-end because if insects are present in abundance, you're going to be up to your navel in them either way.
We are not done thinking about this issue yet. There may be ways to reduce the intensity of the enter-exit insect surges. That's a project for future development.