I like most of them and think they are good quality, especially for the price. The G-Shock suffers a lot(at least in America) as Casio was/is a leading manufacturer of low priced import items, so the perception is still that they are junk or low class. The broad spread of models has made it a little hard for collectors to discuss models, since there are so many that are just barely different.
Article on "G-SHock" book.
http://www.thedigitalwatch.com/Archives ... le_004.htm