Charlie -
That is the same system I have, except I don't have the pressurized tank. You probably won't need to use that, unless you don't have enough water pressure for some reason. I'm happy with the system. It takes up less than 2'x2' of wall space. As long as you have this much room, and a drain to run the waste line, you'll be fine. One tip - keep an eye on the DI cartridge (it's the clear cylinder on top). As you use the system, the resin will settle and you'll get a void on the inlet side. You'll want to top it off with more resin to maintain its efficiency.
It took about a full day using this system to fill my 120 g tank.