Get someone who really knows their stuff and takes pride in their work to do the install. I've had two done by electricians that were botched and one by a fridgie that was perfect. I'm not saying that all electricians are like this, but it pays to find out how experienced the installer really is. Some of the places selling these things will swear that their installers are super experienced and are absolute experts, then outsource to the cheapest place that wants the job.
Don't be tempted to get a bigger capacity unit than what you need. In milder conditions, it won't be able to throttle back far enough and will end up "short cycling" (i.e. running the compressor motor in short bursts) to maintain the set temperature. This isn't good for the long term reliability of the motor and compressor.
I've had good and bad with different brands. Daikin seem to be the best, but expensive to buy and parts prices are so high that you throw the whole unit away when it fails. A number of relatives and friends have had Daikins fail just outside warranty. Having said that, I have a 15 year old Daikin 5kW unit still going strong. Daikin is popular here in Tassie because they seem to heat better when the outside temperature gets below freezing.
The last one I bought was a Mitsubishi Electric one. It seems to go well, although it's not as good as the old Daikin in our other room for heating on really cold nights. Happy to elaborate if you're looking at heating in Canberra Winters.
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