Every time I switch to a new Gillete razor (sensor, sensor excel, mach 1, mach 2, mach 3, etc.), I swear it will be my last change. Each razor seems better than the last, and each razor is certainly good enough.
But Gillette keeps innovating, and the shave does keep getting better.
The Gillette Fusion has (I think) five blades on the main shaving surface, and the back of the razor doubles as a sideburn clipper. The shave is something like running a zamboni over your face - it's such a wide shaving surface that the scruff just comes off.
But that being said, these things just keep getting pricier and pricier. The Fusion is something like $12 off the bat, without replacement cartridges. And I don't really understand what the battery power is for, and I I'm skilled enough to use the normal shaving surface on my sideburns without needing the blade on the back.
I think I'm done upgrading - the Gillette Fusion will be my last switch.