I used to drink quite a bit of irrigated wines from the Griffith area, passable. Would load up there on my way back from hunting trips.
They don't match up to the vineyards that rely on natural rainfall. Having said that, the wine is a fairly standard product year by year. OTOH, non-irrigated vineyards can be a gamble, terrible one year and superb the next.
The best wine I have ever had - and it was only $15 a bottle from the cellar door - was Booth's 1990 Premium Shiraz. Once it was opened, there was no stopping until the bottle was empty.
Cliffy Booth was the winemaker, how he made those hypnotic Shiraz is a secret that died with him.