Mine all working good for the past 2 years. Just regular filter cleaning, monthly basis.

I have Panasonic (2++ yrears), York (2++ years) and Samsung (6 months) inverter aircond. Since changing from non-inverter to inverter unit, on average my electricity usage do drops. Inverter unit only good IF you use them for long hours. Min 3 to 4 hours a day before it shows significant savings.

As for Panasonic unit, I have no qualm about the unit. Have been working flawlessly since day one. Silence, no significant noise increase.

Do calculate the space that you plan to use the AC. Right hp is important.

I'm using this inverter model (4 months old). So far so good. Cold and silence.

Yah, the design very nice, modern look. As for maintenance, it's very easy to clean the filter, it's mounted on outside of the unit instead of inside like other brand. Interior cleaning, sorry, no idea. Normally, I just call the expert. Total dismantle cleaning. Once a year.