Half posting this just to get opinions since there's no history on here. Came up as an ad on Instagram for me (which automatically makes me sceptical), but they are Aussie wool, designed and made in Tasmania (and I generally much prefer supporting Aussie made).
The blankets come out to 452GSM by my math. Only the throws are listed as "Australian Merino Wool", the others just say "Australian wool".
Waverley Mills make really good stuff, and they do it in Launceston, Tasmania, not China.
We've got a couple of their blankets for various uses.
(Also, 'Merino' is just a type of wool from a specific breed of sheep, sometimes it's the best wool for an application but it sometimes isn't, e.g merino isn't always the most durable.)