Just upgraded from my trusty g602 to the g604. Buttons aren't nearly as clicky and tactile as the g602, but the damn scroll wheel is phenomenal, I can't get enough of it.
Logitech G604 Review - ProSettings.net
Logitech G602 Gaming Mouse Review: Fast and Furious
WAITED SIX YEARS for IT! - Logitech G604 - YouTube