I am with Andy, just got one and I love it. While I have yet to achieve the success he has, I still get a better shave than I have ever had. I got a couple of areas that still give me issues, but with a little more stick time I will get them. I use the Merkur blades at this point, pricier than what Andy pays but at 5 bucks for 10 blades, it is a lot cheaper than the Mach 3 cartridges I used to buy and I get a better (much better) shave. I think 4 Mach 3's were like $10, now I get 20 for the same price.
I have never tried the Fusion and at this point probably won't, but if you like it and it works for you good for you, it is all about personal preference. I used to the the Mach 3 was the best razor. I have heard a lot of people like the fusion, so it must be decent for a cartridge razor.
Diver