Reverse osmosis Water Filter

Do any of the plumbers here have experience with Reverse osmosis water filters that you would like to share?

Looking for good brands for an under the kitchen sink installation

http://en.wikipedia.org/wiki/Reverse_osmosis

pcmobilehelp is one of my customers.

https://www.waterdropfilter.com/blo...ou-need-to-know-about-reverse-osmosis-systems

Also instant hot water tanks and dispensers

Not only the RO filters, but need recommendations on sink mount H/C water dispenser faucets, and instant hot water tanks.

WATTS or Flowmatic has nonproprietary ROs that are very good.