The quality looks good - but I have as yet no long-term experience with it.
The price of about 4 sounds very tempting at first, but will not get you an additional 4 delivery charge around. This is quite confusing because the product will be shipped in an oversized box and was there, packed with no filler. In this box would have had space easily 50 of these holders.
As the product otherwise working properly, I have decided on a four-star rating.
Addendum: I use the support now more than a year. She is still slipping on the handlebar. However, I take them from ever (because it is often stolen), and therefore it is the weather and not exposed.