Came back to this thread to take a look on behalf of a friend.
Just realised it's been about 2.5 years since I changed to my Panasonic non-inverter system 3 from Natural Cool (my previous post is somewhere here). Other than routine filter and fan self cleaning, haven't had the aircon maintained or washed since then (certain family issues, my parent doesn't like outsiders in my home). I made the mistake of accidentally spraying water into the circuit board area of my FCU and now the Eco Patrol LED no longer works, but the operation is not affected and the unit seems to be going strong.
If there is anything that Panasonic could do better, it could be fan cleaning. The fan is a b**ch to clean.
On the strength of my recommendation, my gf also had slightly newer system 2 version of my aircon (this one has Eco Navi) installed by same company last year.
Our systems are configured to only 9k BTU for our rooms but both have no problem freezing the room within 15 mins even on this sunny afternoon.
So, yes, if anyone asks about either of those 2 brand names I mentioned, I would recommend.