Check out the review at chess.com: https://www.chess.com/blog/shaun/do-you-need-a-new-chess-clock
I have helped on this clock for close to 5 years. The back story is pretty interesting. I ran into a dad buying a chess clock for his kid at the National Open. He was complaining how his kid left his Chronos Chess clock at home and he had to buy him another chess clock. We started talking about chess clocks and after explaining it to him for a while he told me that it was very close to what he manufactured. Turns out he makes gas pump display and signage. It took us a LONG time to get the clock to where it is right now and we think it is the best clock on the market.
If anything happens, there is support in the USA, Dallas actually! If anything goes wrong with the clock, they should be able to fix it for you. You get 1 free firmware upgrade after you register your clock with the company.