Those do look like they might be a bit more solid than the Milenco, though I never really had much vibration issue with them. I imagine it depends mostly on the mirror housing, like baglo alluded to.
2017 Escape 5.0 TA (someday soon, I hope )
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln
Again, I have no problems with the standard (convex) Milenco mirrors; they have been the best of many different trials. My point is if you exchange the convex for a flat mirror, any stock mirror housing shake will be amplified compared to the convex mirror. Just a warning for anyone who wants to make the change...