It seems as if most things I do have both positive and negative ramifications. I just try to make sure that the positive attributes will vastly outweigh the negative one's. This bug guard does create a little bit of wind noise, but barely noticeable. I read a ton of posts that bug deflectors were useless. Well, if they are all designed like this one was, I can see why. Now, I'm not an expert, but have taken a number of physics courses and have a machine shop as a hobby, so I do a lot of real world projects. It was my opinion that the rear edge of the shield needed to be raised to create the type of aerodynamic effects needed to deflect bugs, so I sandwiched the rear edge of the plastic with two pieces of 3/4" x 1/8" steel bar stock. Then I took about half an hour slowly heating the steel with a heat gun. When the plastic was pliable, I put about a 60 degree up-angle on the rear edge. So far, only the huge bumble bees make it to the windscreen. YES, it helps a lot with the smaller bugs. I'm not certain about the ideal angle of the rear edge yet, but this is a vast improvement from having nothing at all.
One interesting side note. I always Rain-X the windshield so that at speed, you really don't even need to use your wipers since the glass is so hydrophobic the water just beads up and flies off. After the addition of the modified bug deflector at hi-way speeds, the beads of rain would sporaticaly dance around the windshield. First going up, then down or sideways etc. Obviously, there was a lot of chaotic turbulence taking place at or near the windshield. Now, I have changed the angle just a bit in an attempt to shift the turbulence to just above and behind the windscreen. I'll re-post when I have more data.