I use the 3 bladed Mach 3. Recently just picked up 10 Mach 3 turbo blades at walmart, haven't had a chance to use em out yet. Don't really know the difference between the regular and the turbo, I'm guessing not much if any (except for 4 extra dollars), but I'll try em out.
Being new to the whole sly thing, I'm trying to figure this out for myself. I have a theory, but not sure if it bears reality well or not: I think maybe, if your head is more smooth and evenly round, a 5 blade is good; but if you're like me, with a very "shapy" dome, w/ certain ridges or large bumps, whathaveyou, a 3 blade may prove more flexible. Also, I have to deal with the damn HT scars in the back (and side), which makes shaving the back of my head extremely tricky; in fact, right now, I have my wife do it for me with a triple blade. I still have more blades to test though. I now have a Hydro 5, a Sensor 5, and a Headblade with the triple blades&yellow adapter. I use my headblade on the top of the noggin, and sides, but a regular razor for the crazy back of my head.What do you guys think of my 3 vs 5 assessment in terms of flexibility?