Seems like a good price for this Kontakt Virtual Instrument - like a VST but requires the free Kontakt Player to use. I think this is designed to be used in a mix rather than played standalone - comments suggest it's a bit low in the bass.
This is a 6.9GB download (17GB uncompressed).
AU$149 to buy direct from Native Instruments. See here for more details: https://www.native-instruments.com/en/products/komplete/keys…
Supports Windows & MacOS, and possibly hardware like the standalone Maschine+
EDIT Also comes with your choice of freebie when you purchase:
It's a good price for a well recorded studio piano. I have it as part of the Komplete collection but to be honest I've never used it, because I find it a bit "thin" sounding for my tastes and it's quite distinctive, which is not always what I want from a piano in a mix.