I normally buy KMC chains but the HG40 came in a chain/cassette bundle so once it wears out I will return to normal.
Update: I have just fitted the chain with a KMC link. The only niggle I have is that the side plates on the Shimano chain links are shaped slightly barrel shaped whilst the side plates on the link are flat. It doesn't seem to make any difference though. If the chain is as crap as suggested it wont be on there too long anyway