They are very robust and I have never had to have any service done on them. I do not time watches to the seconds but they are accurate to the minute as I check them to the clock on the computer. Perfect weight and size and the design is one if not the best out there. The dial is imo perfection, well balanced, clarity and very attractive to look at. Go for it you will not be dis-appointed. Oh and did I mention it's the best bargain on the market John
to play with the chrono and it is still as accurate to the minute compared with my handphone over 2 days of power reserve. the slow rate of beat at 18000vph means longer service intervals. However, the reliability of the watch also depends on the provenance of the watch. i feel that this is the closest u can get to the grail vintage VC chrono at the moment.