I'm using 2x Fluval G6 on my 115G tank.
Easiest maintain ever but it's only good for tank below 90G. Also, for the budget you might get better deal with FX6 and it's much cheaper. I chose G6 cause I love the concept and high tech stuff and they work great for last few years, I reuse the mechanical filter over and over, I'm using Purigen in place of carbon. So for final thought only buy G6 if money is not an issue to you or you wanted a quickest maintain time just swap out the filter with clean one done less than 1 minute (required to buy extra for swapping).