UPDATE: Prices now reflected on web site.
This is a few dollars more expensive than at Telstra, however, Telstra only sells the black ones. HN stocks white ones. I tried to get HN to price match them a few weeks ago, but the guy refused because he said Telstra was not someone HN price matches due to them being a telco (Optus would have also fallen under that) and Telcos only sell limited range of product so they aren't on the white list (which sounds like BS to me), and he would have only PM'd the black one even if he did it. Your mileage may depend on who it is you talk to.
Additionally, if you have the AMEX statements credits deal saved, you can get $30/$50 cashback, making it better than buying from Telstra.
Other things in the ad include a Google Chromecast for $38 and Sennheiser 'Urbanite' XL BT headphones for $198 after cashback (I've no idea if that is a good deal or not).
So the Title should read;
"Samsung Gear S2 Smart Watch WHITE $377 @ Harvey Norman"
Regardless of colour, this is not a deal as you can get it cheaper from Telstra.