Hi Mike,
Thanks for your kind words. There seems to be more than a few who love this reference. The closest watch in the current GP catalogue is the Ref. 49585 which is 40mm in size and has a solid case back, but otherwise has a very similar dial. I will do a post on this shortly as an alternative option.
In relation to pusher feel there are a lot of differences. The Zenith El Primero is obviously a column wheel design compared with the cam/lever of the GP. The Zenith has a shorter 'throw' to activate, is softer to press (although still finishes with a distinct 'click'), and you can almost feel the column wheel rotating under your fingers. Functionally it is let down by the smaller pushers.
In contrast, the mushroom pushers on the GP are nicer to use, but there is more 'dead space' before it activates and with the cam it is more a notchy hard click to finish.
All difficult to describe over the internet! Neither watches are as smooth as a VC or ALS chronograph. And of the two I prefer the Zenith. I will take some photos of the Zenith Prime and 1999 Chrono side by side at some stage.
Regards
Andrew