The only issue so far is because you can adjust them up/down and side/side they move around a little and have to be adjusted a little. Other than this, they are great.I've bought one for my car, and then another one for my grandfather. These give you a greater view of the sides of your car and eliminate blindspots which my Volkswagen GTI had an issue with. They rotate all directions and then keep their position.It seemed to have slick design. But after attaching it on my sideview mirror, I noticed it would not tilt to the angle I wanted. Its design prohibits tilt it to certain angles.Good priceI have been looking for a great mirror and I found it. A friend told me about this mirror and I will put it on all of my vehicles. You can see alot and it helps. I would recommend it for sure!I bought this product in order to try to prevent a possible future car accident. A couple times in the last few years, I have almost had an accident when I changed lanes and did not see a car behind me because it was in my blind spot. The newer car that my wife drives has blind spot alert monitoring (light comes on in the side view mirrors), and I would not buy another car without it now. However, the older car that I usually drive does not have blind spot monitoring. Although very easy to install, I did spend about 20 minutes trying to figure out where exactly was the best location to mount the little mirrors on each of the car's side view mirrors. The directions did not give any recommendations, and the reviews on the Amazon site showed various locations. So, I experimented using some Scotch double-sided tape to temporarily place the little mirrors in various spots and also used a blue trash can behind my car in the driveway in the blind spot area (see photos). First off, I was actually amazed at how large a blind spot I really had and how well the little mirrors showed the blue trash can that had not been visible at all in the normal side view mirrors or even if I turned my head around and looked as the rear car pillars on either side blocked my view. For me, I found that the best place to mount the little mirrors on my car's side view mirrors was on the lower edge, midway from the outside and inside edges, on both the driver's and passenger's sides. The little mirrors have an adjustable ball pivot allowing you to slant them up or down, left or right for fine adjustments. This is a really a good design feature as they would not work very well at all if you had to mount them flush to the surface of the side view mirror itself. So far, I am very pleased with this product in terms of its quality and ease of installation with the 3M adhesive strip. My only concern is how the little mirrors will hold up long-term through car washes and inclement weather. However, at $8, I guess I can afford to replace them every year or so or how ever long they last. If these little mirrors will help me avoid having a car accident, then I am quite certain that will be money well spent.Does a good job on the blind spots. Easy to adjust, quick shipping.My Tesla Model Y does not have blind spot check light on the side mirrors. You have to use the touchscreen which is not a practical way when changing lanes. This small mirror works well, better than those round ones as it provides a wider/less distorted vision. As long as you keep it clean, especially in cold weather, you will have a reliable blind spot check. I am happy with the purchase.I had seen these before, but never tried them. I got this one a few weeks ago, and now wish I had purchased one sooner.Bought these for my husband's Jeep pick-up and he loves them. Very useful!! Highly recommend.Really nice and handy not too big to cover actual mirrors which I really like and enough to check your blind spot and cool thing is that you can adjust itI have a Chevrolet Cruze and it have a very small mirrors, terrible blind spots. I had tryed the square blind mirrors, but they are terrible, too small and narrow view angle (too flat) These are excellent, no more blind spots!