Was quoted $1,270 for RO system

Hi, was quoted $1,270 for an RO system with a pump by the water treatment company we purchased our water softener from (includes install). I wasn’t given any information on the brand, but I’m now seeing many systems online for around $600 or less. What could the difference/benefit be that would explain the higher cost?

Some info if you have a system recommendation to offer: have softened well water, experience iron bacteria, an under-sink system won’t fit but have space in the mechanical room to hook up to refrigerator dispenser, want it taste like absolutely nothing, only need about a half gallon a day.

Thank you!