I pitted the Fusion (Turbo blades) against both the Mach 3 Turbo blades and the Gillette Sensor (old two-blade style, yes the one your dad uses).
I used the fusion optimistically, in other words, I wasn't negative when trying it out. I actually thought it was pretty cool. After I took it for a spin, however, I felt it was just ridiculous. Apparently, Gillette is hoping that the fusion will have the same success that the Mach 3 line did. It most definitely will not. There is simply too much friction with 5 blades, and I nicked myself three times (I normally don't nick myself and hardly ever more than once and that's when it's in areas around my chin). I shave extremely carefully, too, as I have sensitive skin. It's the shaving equivalent of running a lawnmower over your face. It's simply too much. The thing that gets me is that, from an article I read in Cargo, Proctel and Gamble's acquisition of Gillette was partly contingent on this product. The president of P&G tried it first, and apparently liked it.
I've used the Mach III (turbo blades, not with the power on, that's just stupid and doesn't do anything). It's trusty, and does the job, although sometimes it's slightly painful around the edges of my chin. I thought to myself, and realized that I can't ever remember my dad nicking himself and he shaves fast and against the grain (his skin's as hard as nails, though). Anyway, he uses the old Gillette Sensor 2-blade. I decided to add it to my test.
The winner of the three? >> Gillette Sensor . One of the better shaves I've had in a while. Doesn't nick or pull around my chin, and is pretty smooth. You need to add a little pressure to go against the grain (I do lightly over my chin and upper lip). No nicks. Smooth, and the blades are really springy (the Mach III blades don't have any spring feeling). And in the end of the day, it's just as close as any Mach III (depending on how you shave).
In theory, Gillette claims that "you take one stroke, it takes Three" when referring to the mach three (or five, if you're a fusion user). So really, it's all about saving time (assuming quality is equal). Dermatologists claim that anything more than two blades is just irritating for your skin.
So again, winner: Gillette Sensor. don't waste your money on the Fusion, it's just really a ridiculous product, and next thing you know, Shick'll have 6 and they'll bite back with 10. Really bad for your skin. If you're a Mach III fan, give the Sensor a try (2 blade version). It's cheaper, too. If you use it, shave slightly slow and gentle. It may take two light strokes, but you don't feel all the friction you do with 3 (or 4 or 5) blades.
[Edited 2006-02-05 17:18:33]