My buddy Franc was doing some research trying to convince himself NOT to make the mistake of buying an Omega GMT 🙂
He came across this really good watch blog that had a great article on Rolex GMT’s and he sent me the link. – http://www.fratellowatches.com/
It was started in 2004 by Robert-Jan Broer and since 2012 he is full time involved in watches.
Certainly a site and an objective worth emulating.