I have purchased a total of 26 glass doorknobs. So far, I have installed 8 and one glass knob fell off the fixture during the installation. All of my orders have been delivered promptly, and all parts appear to be included in good packaging. I love the quality for the price except for one exception that one glass knob has fallen off. I glued the knob back onto the fixture and it appears to be holding with super glue.
I have not brought this to the attention of Probico. I will if the glue I used does not hold or if I have any problems with the remaining doorknobs that I need to install. So far, I have made 4 orders and will continue to buy more products from Probico in the future.

Very pleased with these crystal door knobs, solid and beautiful quality. Adds vintage, yet modern charm to our home. 5-Stars all the way!

Fort perfect and works well. Durable

Love the door knob. Adds an elegant touch. Turns but not the same as normal door knobs. You have to use a little muscle to do it. Otherwise I am happy!

Beautiful, As pictured and easy to install. privacy and passage bought. Handle has a lot of weight to it. Just installed, will see how time treats it but definitely hope they last.