Well, my 10 year old Mermaid 16.5k got a leak in the heat exchanger. Decided that rather than try to repair it, I called to order a new one. List price about $2300, but since I'm replacing one of theirs, they applied a $500 credit. In other words, if you decide to buy a Mermaid, you should ALWAYS be replacing one of theirs!
That's the good news. Bad news is that they are out of stock right now for est. two weeks, waiting on a shipment of condensers. Oh well, at least I have one big unit and the portable one running.