That's a problem, cause there is actually no "real" service or site where you can look up if a specific region B version is running on a region A player (at least i don't know such site). Actually more people with region B players are asking if region A releases are working with their system
In Europe the HD movies are still a niche and very few people have a region A player down there and it's quite risky to order such a title from region B, since the euro prices are extremely high and you would be quite annoyed if your import is not working. But there are some peole who have region A players and are testing the region B releases and they will report in forums like this if something is region free or not