Extract from James Halliday's Australian Wine Companion 2009 Edition.

Five Stars (= Outstanding winery capable of producing wines of the highest calibre)

Hans and Fransien Haan established their business in 1993 when they acquired a 16-hectare vineyard near Tanunda (since extended to 19 ha). The primary focus was on Merlot, in particular on the luxury Merlot Prestige, supported by Semillon, Viognier and Shiraz. Exports to all major markets.

Wilhelmus 2005 — Five Stars — Rating: 95
Has that hallmark softness of all the Haan reds, finishing fermentation in oak part of the reason; a supple, smooth and round blend of the five Bordeaux varieties.
Cork. 15% acl. To 2015.

Shiraz Prestige 2005 — Five Stars — Rating: 95
Has the extra degree of intense varietal fruit and gently opulent oak; has length, and a supple, velvety finish.
Cork. 15% alc. To 2015.

Merlot Prestige 2005 — Five Stars — Rating: 94
Bright colour courtesy of 5% Viognier co-fermented; a sumptuous, velvety wine, with lifted blackberry, dark chocolate and mocha flavours supported by ripe tannins; in the mainstream of Haan style. Cork. 14.5% alc.
Cork. 14.5% alc. To 2020.

Haan Viognier Prestige 2007 — Five Stars — Rating: 94
One of the best Viogniers going; flowery, aromatic apricot nuances on the bouquet, the palate adding touches of fruit spice and musk; long finish, no phenolics.
Screwcap. 14.0% alc. To 2011

Halliday Rating Scale:
5 stars. As close to perfection as the real world will allow — 94–97
4 1/2 stars. Excellent wine full of character, of gold medal standard — 90–93
4 stars. Very good wine; clear varietal definition/style; silver medal standard — 85–89