I have a G700 and make use of all the buttons.
Plus Logitech has awesome warranty support if you are ever called on to use it. In both of my experiences with a k/b and set of speakers replacement product was shipped each time without receipt, serial/PID number was all that was needed over the phone.
Customer for life.
Word. I had a pair of Logitech UE Ultimate Ears headphones, at one time I accidentally touched it with a magnet. Logitech gave me a new pair, no question asked. That's PRO!