I just got back from a 20 minute ride, my first ride since removing the bar end weights and installing the trackside guards. If there's a difference I certainly can't tell. Maybe slightly buzzier but nothing to complain about. I rode through the whole RPM range at different speeds and the biggest difference I can tell, and it's a good difference, is my left mirror seems clearer at certain RPMs. I used to have a bit of a shake in that mirror at times, that has gone, both mirrors are clear now.
So far I can recommend the Trackside guards. I don't know if they are as good as the more expensive brands but they seem to be worth the $50 they cost me and I'm not seeing any harsh effects from just removing the bar end weights and bolting the guards right to the ends of the bar.