I have the same unit, only it's a 5-stage rather than 6.
Great Price, and it seems to work well (I still need to get a TDS meter).
It sure beats lugging jugs back from the store though.

I set mine up so that it dispenses RO water from the tap (the little spigot that comes with the kit) and then I plumbed an extra fitting under the sink connected to a plastic tube that I can run to the sink to fill the jugs with RO/DI.
You sure can't beat the price... I think I paid $109 for my setup about 6 months ago.
Though now that I look again, my kit came with the 4-gallon reservoir tank... you may want to look into purchasing one of those as well... RO/DI takes 'forever' to filter through, almost the equivalent of watching grass grow.

I do 8-gallon changes on my 55g tank, and it usually takes a little over 2 hours to get all the water filtered, even with the 4-gallon tank.
HTH.