If you plan on having the RO water run through your water lines be forewarned that it is aggressive to copper and brass and will deteriorate such materials. When running water lines for RO lines they must be entirely plastic, including the tees, elbows and other fittings.
If you're just doing a point-of-use system for a drinking water faucet then you'll be fine. I'd stick to a standard price unit from an established manufacturer, if its got a slick pile of marketing and an elevated price tag, note that most of that price is mark-up and sales commission. The scare tactics used by so many water filter outfits is probably the pinnacle of fear-mongering.
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"The trouble with people idiot-proofing things, is the resulting evolution of the idiot." Me
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