I'm a big fan. I have more GEM blades stashed away than all other blades combined.
They are very stiff, unlike flimsy, fluttery DE blades.
They are reasonably priced (from 2.4p each when bought from Connaught).
They are sharp.
They are not ridiculously wide - unlike Feather AC blades.
They last longer than DE blades.
They fit in my Ever-Ready 1912. For that alone I bought 100s of them
I'm actually not sure if I'm a bigger fan of the blades or of the 1912.
I'm in two minds about a modern GEM-SE razor. On the one hand I'm intrigued and can't wait to try one. On the other hand I have my doubts if it will improve on the old classics. Also, you can still pick up a 1912 for a tenner or less.
Only a pass around will tell...
Hint, hint, hint...