The materials used are of good specs.
But price a bit on the high, maybe due to good quality of labour & materials.
look for quality and experience installer they have. extra $$ will save your headache.
Unit won't give issue. during installing, I will check their tool which brand they using if come to me.
For example if they using lousy tubing bender, u will see the pipe will wrinkles or slippage marks. also take note what type of cable . Anyway they will PVC insulated wire ( cheaper) for them. 2.5sqm cable and above ( at least). some they cheating using 1.5sqm wire.