I own the Aquasafe too and I have always thought of it as a good bang for the buck. However, I am not a fan of the DI stage. Water flow does not travel through it evenly, and you will be throwing out expensive resin before it is fully spent. I am looking to buy a vertical DI unit, or at least mounting the one that I have vertically. There is another company called Purely H2O sold through Extreme Marine (I don't know who else retails) has been given some pretty great reviews. The prices are good too. Take a look.
Not knocking Aquasafe, just referencing other alternatives.
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