It is always a bit of a risk buying off beat brand names with this type of thing , quite often there will be 6 or more different brand names produced out of the same factory in China , but they have different quality levels in regards to the parts used in the manufacture , and may also have a different warranty period
if you can find a Panasonic in the size you are looking for , at a reasonable price , go for it .
Qualification for the opinion is I own 2 airconditioning businesses in Australia , best of luck , and just pm me or post any other queries you have here , if I can help with the decision I will , regards Tony