I have 4 Jiusko watches and all perform well for me. My oldest is about two years old. and two of the watches are worn at least weekly. The Jiusko tourbillon is saved for special occasions. Plus, Jiusko customer support seems to be honest and timely, although I've had no personal need for it. All have sapphire crystals, one has a ceramic bezel, the cases are all solid and the straps and bracelets are better than many OEMs.