As far as fitting under ALL sinks, there will always some that cannot accommodate it but other ROs would be even harder to install, in general.
It doesn't need a permeate pump unless incoming water pressure is too low. That would be needed with another RO even more because standard ROs' membranes are also fighting the air pressure from the holding tank. It doesn't need a delivery pump because it uses your household pressure (30-6 psi) instead of tank pressure (7-11 psi). This shoots water to the faucet and fridge and pressure doesn't decrease as tanks empties like in air-charged tanks.
Tank refills immediately after drawing water not waiting till 60 volume is lost. This keeps the tank full all the time.
I would say marketing needs to improve. price is extremely competitive.
Presently, there are limited filter options but I think they are working on that.