I have some mirror brackets off of a uhaul I scored. I love them since they allow me to see where I need to. I am constantly surprised at the crap people tow with stock mirrors. Clearly they don't back around corners with the trailer and merge on hopes and dreams.
Anywho what I hate about them should be fixed by the advice of
@catbird7. I should go back and reinforce the bottom bracket on the inside. I used stainless hardware all the way, all through-bolts for me. Dunno why you can't use lock washers... they fit fine inside the door. But blue threadlocker FTW! I'm fairly certain I only used lock washers and they haven't rattled loose yet. But the blue stuff is one of those things I wish I'd known about in me 20's!
The reason I switched to west coast mirrors was because I tow my trailer a lot, sometimes camper and trailer. See avatar.
And for many jobs I have to back that trailer up a ways and around corners, besides that merging something 45 feet long on the freeway is much easier when you have real mirrors.
The blind-spot issue is real but my day job is a commercial driver so it's all normal to me. So if you're not used to it yet, get ready to move around in your seat to see past the mirrors!
The thing that gets me the most is the pedestrians. They are fully covered so easily, it's a pain. Then of course they act like you are horrible for what you can't even see.
BTW Amazon has heated straight mirrors and 7" convex for a good price, I finally installed them last fall and it's so nice! I'm in a very rainy and moist climate so the heat makes them evaporate the rain off even when driving in it. Plus if you rain-x them you'll wonder why you haven't done that all your life.