Even at half price it is what $125USish? Thats a lot of money for a pretty reservoir that not only is fairly useless in that system but also takes up a lot of extra room and is just another restriction in the loop. But if money is not a issue and you like a big blue tower taking up room then have at it.
You could easily make a nice reservoir out of PCV pipe that the pumps will fit in and it will cost a fraction of the price and probably take up lessroom.