There's no information given to help the buyer evaluate this blu-ray, so be wary. I've rated it at one star NOT for the quality of the film, which is easily a 4.5, but because the quality of this particular BR is a total unknown.
However, before you buy, consider that the Canadian regular DVD release of this film, from Alliance, was in the widescreen ratio of 2.35:1, as it was in the theatres. However, the director's preferred ratio was 1.78:1. Not only that, but the Alliance disc was non-anamorphic, and did not include the director's earlier film, "Offerings to the God of Speed," a documentary about the real Bert, as an extra. The US DVD release was in the correct aspect ratio, and had great extras.
If Alliance is simply re-releasing their DVD in high def with this blu-ray, then I would say, don't buy it; get the US disc, which has the correct aspect ratio, and better extras. Keep in mind too, that Alliance released Good Will Hunting in a non-anamorphic DVD and kept it in print for years, despite customer complaints, and that when they released the title on blu-ray, they did so in 1080i rather than 1080p, and again, with no extras. Alliance's BR release of The Pianist was also in 1080i, a fact which they decided not to put on the box, thereby getting people to buy the damn thing, only to find out when they got it home, that it was an inferior pressing.
One final note: the US Blu-ray is region free (according to websites I've checked), meaning that, if it's cheap enough, you can also safely get it through Amazon UK.