Not at all!! So, as you know, you want a windscreen you can see over easily (not designed to look through); however, if your "sitting height" as compared to the the windscreen height is off, the air coming off of the top of the windscreen with may hit your helmet in such a way to cause a vibration or buffeting... which is aggravating and tiring on your neck. This is generally at higher (freeway) speeds. I'm 5'10" with a Triumph touring seat and I've had no issues with my tall screen. When I ride my wife's Fat Boy, I can get some buffeting on the freeway as her screen is lower as the air hits me in the wrong way. WIndscreen's with vents tend to help reduce or eliminate head buffeting if you have that issue.
-MIG