Just thought to share with you my Casio experience.
Brought this in 2004, wanted a G Shock then but had limited funds, 10 Year Battery, cost £20 and it has been totally hammered since.
My most worn and used watch ever.
I thought that it would never stop, but it did so earlier this year after 15 years of faultless service.
Still, I am getting a new battery for it and will wear it occasionally.
It has been a great friend with lots of memories attached. Cant even bring myself to clean the dirt off it!
Best wishes to all of you G Shock wearers.