Dato is THE CHRONO WATCH to own.
It is now offered at very attractive price in secondary market (undervalued to me), can't see how this will last.
The only complain I have on Dato is the luminous hands, other than that it is as Perfect as it can be 
I recently read a well known HK watch magazine , "Watch Critics' and its author (supposingly well known , maybe the HK purists can tell us more about him)......
he claims that Datograph has better movement finishing than Datograph. Is that true?
Well he once also claim that Patek 5970 has better finishing than the 3970, I have seem these 2 before and agree with him. So I wonder is his claim on the Dato and 1815 chrono finishing hold any truth.
Cheers,
CL