Together with the Datograph, this is by far the best finished movement in my collection (until I finally get my hands on a 5370P, but that might take a while )
Actually, the pusher actuation is really good, second only to the Datograph (the 5170's chrono reset pusher feels relatively light compared to the start/stop pusher).
Comfortably hidden under a sweater. As I type I can see its impression under my left sleeve. Very happy! We achieved a wonderful deal with this reference because it's so complicated and used in the 5270, 5370, etc. Very satisfied with the technical value ...