I enjoy the old Schick's a lot. I don't have many different variations but the 1930-1940 Type E treat me well. What I like most about them is the firm single edge, they deliver a shave that is different than (even superior to) any other DE I have. There aren't a lot of blade choices for the injectors but I managed to get my hands on the first blades made/sold buy those guys that made a modern version of the old Schicks (I think they are called "Supply" something) and I like those blades a lot.
Honestly, I don't grab the injector all that often but if it was all I had on a desert island I would probably be happy enough.
I don't have a problem with the newer (1970+) Schicks but I just like the older versions better, they look better and seem to fit my hand/face best.