CSUN panels & Growatt inverter quote

We have been quoted a price of $7200 for a 6.6Kw system - 22 x 300 CSUN mono panels with a 5KW GROWATT inverter, fully installed with tilt frames on 2nd Storey flat roof. These brands haven’t been mentioned in the top 10. Are these brands any good?
We are in melbourne.

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