i've got one myself, it has a much different character to the speedy being smaller with no dark bezel. a great watch.
to go into more detail about the movement. Omega have always used Lemania to make their chronograph movements so until you get to the 90's onward seamaster and speedmaster auto's with valjoux 7750's inside all Omegas chrono's had lemania movements. i hope that makes sense.

best
Graham