The only thing I see better than the fx5 is it's looks, which as you can see is Fluval's major selling point. when compared to the fx5 in performance, the G6(which will run you $500) only does 1000 lph or 264 gph vs the fx5's 925gph. Another "advantage" is how it monitors your water, which unless you have a new setup will pretty much be useless, unless your one of those who checks their water daily. And I would rather spend $3 on a thermometer than a couple hundred on a filter that watches the temp. Plus shiny things tend to break easy..lol.