Having just gone through the mirror update I found the grand milencos not very secure on my Mazda CX-5.
I wasn't happy about just relying on clamps, so I've replaced them with a cheaper mirror from a company part of milenco, these have clamps plus two straps, and a safety lanyard.
http://www.caravantalk.co.uk/community/topic/93056-milenco-grand-aero-gone/page-2
I've replaced two strapon convex mirrors, tried the normal aeros in convex, didn't like them, so took them back and updated to grand aeros in flat, didn't like them, so have settled for convex on the nearside, and flat on offside. Using these mirrors.
http://milencolimited.vpweb.co.uk/Products.html
http://milencolimited.vpweb.co.uk/default.html
But research shows others prefer them differently.
]http://www.ukcampsite.co.uk/chatter/display_topic_threads.asp?ForumID=20&TopicID=289210