What is Reddit's opinion of Pentair Pentek GRO-2550 Reverse Osmosis Drinking Water System, Under Sink 4-Stage Filtration System with High-Recovery GRO-50 Encapsulated RO Membrane, 50 Gallon per Day?

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The P has a permeate pump. Removing it from the build only takes off $10. The number of stages is mostly a gimmick as many highly certified/expensive systems are only 3-4 stage. I'd start off with a decent 3 stage and then you can add on before and after stages if you decide the reverse osmosis life is for you. I like simple and more efficient systems like this one https://www.amazon.com/dp/B09NL5NNLS

The homies that just buy this thingy: * I have no such weakeness*

I think I'd start off simple, cheap, and efficient. The extra stages aren't really required and the effectiveness of that UV setup is suspect. It requires electricity you said you'd like to avoid and does zero to prevent your filters and membranes from getting contaminated if the boil notice was legit. I've only had one boil notice but I have everything ready to go for sanitation and replacement after it's lifted. I'd get something like this until I was sure I wanted to live the RO life

https://www.amazon.com/dp/B09NL5NNLS

On city water and if you're unsure of the RO life I like: https://www.amazon.com/Pentek-GRO-2550-Filtration-High-Recovery-Encapsulated/dp/B09NL5NNLS Not too expensive, easy to get filters you can pimp out, saves water. I had a nicer version made by these guys/gals they were very nice to deal with. https://www.purewaterproducts.com/black-and-white-ro

The GE RO you linked will do the job. I'm not a fan of proprietary filters or gimmicky housing setups. A remineralizer filter goes in the line from the tank to the faucet. Many websites including Amazon sell them. If you're on city water I'd go with a basic 3 stage setup. You can add a remineralizer to the end of that and if you don't get your year out of the first filter, you can add a sediment filter before. Lots of people go big and get a system that tries to be too many things. You just spend more time, money, and frustration dealing with extemporaneous stuff. https://www.amazon.com/Pentek-GRO-2550-Filtration-High-Recovery-Encapsulated/dp/B09NL5NNLS There's a damaged package one for $135 I recommend going cheap and deciding the RO life is for you. You can try that for the first 6 months and then swap in a couple nicer carbon block filters like https://www.amazon.com/Chloramine-Reduction-01-250-10-MATRIKX-Replaces-01-250-125-975/dp/B08NK7JSZL and still be under the cost of the one you linked.

It's about what those companies like to get for their setups. I usually recommend really cheap or non proprietary systems. Silly to drop 5K when $1500 produces indistinguishable results. Look what those 5K+ softeners are going for on FB marketplace when the owners can't swallow $500 service calls. https://www.simplewatersofteners.com/

Pentair Pentek GRO-2550 https://www.amazon.com/dp/B09NL5NNLS