I have two RO/DI units from www.airwaterice.com and have been very pleased. One is the Dual Home/Reef unit with a small storage tank and the other is the Typhoon III. I've been very pleased with both and have experienced no problems.
I've noticed the prices have gone up since I purchased these units, so I'm not sure they're a good deal "price-wise". But as for quality and function - they're great!
HTH
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