I have the 598..and I LOVE it..yes it's smaller than the others..but the price was great..and the great resolution is really nice...and there are sooooo many features..views..it fits well in my boat..seeing stuff below that did'nt know was there..lol..got it last fall...took it out before it got cold here in Pa..went to local lake..was playing with it...came across new structure, pile..I didn't know was there.. before I got my actual brush pile I had located yrs before with DI , and caught lots of slabs...lol..again ...I really love it..still learning ...but...that's what makes it fun..lol...