Chris and I are like long lost brothers. I got a Mach 2 (ok I admit it I'm an old geezer), but I just counted 20 years ago. And I've been stuck on one since. I've actually gone to generic blades and razors from Bartell's (a great local chain by the way) and they work fine.
The other 3, then 4 then 5, well it just doesn't matter for a peach fuzz like me :-0
Now that you mention it, I like Bartells for just about everything. IMHO, the thing that makes the most difference is a decent shaving cream. Tried all kinds, but have finally settled on the nivea shaving cream in a squeeze tube. It packs well for business trips and doesn't smell bad.
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