programmable buttons?
macro recording?
super accurate mousing??
unless you do professional editing for Pixar, I don't see how these features are any help to the average PC user. most of the suggestions ITT are "gaming" mice anyway; extra buttons won't make you better at games.
"feel luxurious" made me lol... unless your mouse is wrapped in suede or fine linen, my experience tells me that all mice feel the same regardless of what you paid.
Actually, it does make a difference, in some games more than others admittedly, in a clouse quarters twitch shooter overall accuracy is seldomly all that important, but if you play something like say.. Red Orchestra, a good mouse with high DPI can make all the difference when trying to shoot than Kraut 500 meters away with your non-scoped rifle.
Also, the more handy buttons you have on a mouse (and that's not just good for gaming, i love the back and forward buttons on my mouse for browsing the net!), the less you have to remove your fingers from the WASD/Arrow keys to activate some other critical function, which means you can still move left or right whilst performing that function, whereas without the mouse buttons, your finger would be otherwise engaged reaching for another key on the keyboard.
And keyboard Macro keys speak for themselves, it's nice to have some extra buttons to attach stuff like speach commands to, or usefull Macro's, it definately comes in handy.
So honestly, what not to like? well the price maybe.. though you can get good mice and keyboards with some extra functions fairly cheap (it doesen't have to be the most expensive kit on the market for it to work), so that's not a big problem really.