Picked up the ol' Mach 3 this morning after not having used it in probably 3 months. Wanted to see the difference.
First thing I can say is that damn strip of blue goo on the tip of the cartridge left my face all slimy. It's funny that I used to like that and this morning it drove me nuts. i had to rinse and rinse and rinse to get my face clean. The second thing I noticed was that I was really having to apply pressure with two or three passes to get all the hair shaved off. It did a decent job against the grain and I can honestly say that there was zero irritation, however, I felt like I was raking my face with it, instead of just letting my Vision glide over my face.
The only area that I really think the M3 worked nicely was under my nose.
All in all, it pretty much sucked. It didn't leave my face near as smooth as the Merkur.
It was a nice reminder of why I made the switch