I Finally bought a chronograph after 2 months of research. i picked this watch up at a certified dealer that is going to drop the line for $1000. The cheapest i saw it on ebay was $1200 so with the factory warranty i was happy with my purchase. As i played with it the chrono buttons stuck 1 or 2 times and i paniced and took it back to the dealer who fixed it instantly. I wanted to know if chrono buttons need to be broken in or does it have something to do with that its a diver-300m? Well anyway its a perfect watch and has everything i was looking for with the exception of the see through back.