The Seamaster Chrono was one of few watches I really wanted, and I was quick to buy when the replica came out. However, the thickness surprised me. It felt like the watch was not properly balanced on the wrist.. I sold it, and were much happier with the thinner TAG Heuers; Link and Carrera.
But, I have just bought another. Will give it a second try. It is one of the best Omega reps! In the end it is all down to personal taste.
By the way, the thinnest chronos are the Seagull ST 175 manual wind powered chronograps as in the vintage Daytonas and some Omegas.