I've had a Vyair RO for nearly 2 years now.
I've only had one problem in that time and it was the high pressure switch failed after about 18 months use.
Was not a big problem and I was still able to use the RO.
I contacted Vyair and the same day they sent me out a new high pressure switch and told me if I required advice or instruction on fitting the new switch all I had to do was contact them.
Fantastic customer service, I would happily of paid for the new switch as I had been using the RO for 18 months.
And the switch was very easy to replace with no instructions needed but it was nice of Vyair to make the offer.
I would recommend them.