Well, I see problems with both units. The one at Foster and Smith is only RO, there's no DI. You can get an add-on DI stage, and I wouldn't use that unit without one. The one on ebay lacks a pressure gauge and TDS meter. Without those, you'll have no way of knowing how well the system is performing, when it's time to change filters, etc. I wouldn't use a unit without a dual inline TDS meter. Without one, there's no way to know that it's working. You can also get add-on pressure gauges and TDS meters. So, unless you find a complete RO/DI system somewhere else, it's going to depend on whether you'd rather track down and buy a DI stage, or a pressure gauge and TDS meter.
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