I have a Logitech G600:
I use it for everything but MMO's (I don't play those). It works great for improving workflow in various applications and with a bit of fiddling, most game controls can be improved with the side pad. It's also a dream for tabbed browsing, since you effectively have 3 rows of forward/back buttons; one row for opening and closing tabs, one for moving left and right between tabs and one for moving forwards and backwards in your browser history.
I use it for everything but MMO's (I don't play those). It works great for improving workflow in various applications and with a bit of fiddling, most game controls can be improved with the side pad. It's also a dream for tabbed browsing, since you effectively have 3 rows of forward/back buttons; one row for opening and closing tabs, one for moving left and right between tabs and one for moving forwards and backwards in your browser history.