I decided I wanted a nice mouse after a co-worker bought a Logitech G7 on the company dime. I don't like wired mice, so I always figured the G5 (similar, wired) was right for me. However, I was cheap and bought an MX400 instead.
Today, I found I could get a G5 locally for 43 bucks, and I had a $35 "rebate on a prepaid debit card", so I figured I'd indulge.
The MX400 I bought last Black Friday, for comparison, was about 40.00 new.
What I noticed immediately was the feel. The G7 I tried had a rubbery, grippy finish, very much similar to the MX400. The G5, listed as "new design", has an uneven finish, perhaps for a better grip. The side panels are strongly textured. Overall, it doesn't feel like a premium, more a "rugged" feel.
The wheel is much more prominently notched than the MX400.
The side buttons have negligible feedback-- it's like going from a click switch to a rubber done, and indeed even feels like the bare dome.
The big "enhancements":
The cord is braided, not wrapped. I like the wrapped look-- what will braiding save me?
The removable weight cartridge-- nice, but gimmicky. I can feel only a minor alteration between no cartridge, 8x4.5g pellets, and 6x1.7g pellets.
The feet are smoother-- perhaps non-friction. I really felt it.
DPI control- why not set it in control panel?
Overall, I'm not sure I wouldn't have been fine with another MX400-- I'll take one to the office.