I dont have anything i can say on this one aside from the bit of googling that reveals Montague used to be known as Heydon Estate which looks to be in Willyabrup, Margaret River, WA.
There looks to have been some big changes amongst estates in Margaret River as last year i did purchase a 6 pack of Jilyara, Williams Block, cab sav 2020 from the same Margaret river area, and their estate seems to have a similar story - a newer ownership that's operating in the area.
As a side note, curiousity got the better of me and i did open a Jilyara, the quality of this wine was outstanding imo. Floral with fine tannins, filled with dark berries and a cigar box taste, very well structured and approachable now, but i see this one aging very well and feel it would be a waste to open more now.
If the Montague is anywhere near as good, then it'll be great to keep an eye on the estates. Really loving the WA cabs, it's hard to go wrong with them.