We have Kelvinator in our 3 bedrooms, 2 of them run pretty much constantly, especially ours when DH is home or when he is on nightshift. Ours has been in for maybe 3 years now i think?
We had a problem with DD's recently, but had it repaired by a friend,and he only charged us $50 for the part, all the phone calls he made to get it, and then to fit it!
We have a LG split system in our lounge room and we are looking at replacing it, even though it is only about 4-5 years old. We had it for less than 2 weeks when it broke. Had every part replaced in it, and in the end, we got another new one fitted. still not overly happy with it, but it keeps us cool, so I shouldn't complain.
Daikin is what we originally wanted, DH keeps saying we might go and get one. BIL has one and it is extremely quiet.

Nic