The design of this mirror is the best I've seen in a rear-facing safety mirror. (We've had two other styles over the years.) At first I thought it seemed a little small compared to our old rectangular mirrors, but because of the round shape it shows you exactly what you need to see -- the child's face, hands, belt buckles, etc. -- without being too big or showing stuff on the sides that isn't relevant. It took less than a minute to get it positioned just right so I could see exactly what I wanted, and once I got it positioned, it stayed in place perfectly. Our 1 1/2 year old can even kick it with her feet but so far it has not moved out of position, which is impressive! She likes looking at it, and I love being able to see what she needs in the back seat. The design is so simple and smart -- much better than bending wires and strapping buckles and adjusting straps as was the case with our old mirrors. Both old mirrors eventually broke, probably because someone put the seat down without removing them because to remove them was a bother, but with this one I don't think anyone could complain about removing it -- you just pull it off and then when you want it again you stick it back on -- so easy!
Full Disclosure: MyTradeWorld provided me with a free version of this product to try out after I bought and really liked one of their other products. The other product, a headrest mount for a Kindle Fire which uses the same simple velcro band concept as this item, is really fantastic too, as other reviewers of that item have pointed out. They are definitely onto something with the simple design of these products!