I purchased my Omega 3570.50 Speedmaster Pro from an AD about a month ago and I have no regrets.  The watch is iconic and retains its' classy styling that dates to the early 60's.  I looked at a few TAG's and Breitling's as well but the Omega felt and looked better to me.  The Breitling is a great watch but looked too busy. The Speedy is a very simple and functional design, easy to read.  The size (at 42mm) is perfect.  Over the past week it has lost only 3 seconds.  The crystal is Hesalite (a type of plexiglass) and can scratch easier than sapphire, but the hesalite remains true to the design of what was used by NASA.

Overall I am impressed by the fit and finish, as well as the accuracy of the 1861 mechanical movement. I look forward to winding it every morning and, as such, it has become a ritual. Shop around because authorized dealers will come down from the msrp.  Buy with confidence.