I think this varies from one filter to another people seem to get Lee big stoppers with no colour cast others I have seen have a strong colour cast. You certainly seem to have hit on a good copy going off your example. The ones I had (Lee) had a definite blue cast but nothing that couldn't be corrected so I don't see it as a problem.
a couple of examples with a Lee big stopper
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damianmkv said:Are you just using a Cokin P ( type ) holder ?
damianmkv said:I don't know - I have a Cokin style one so am hoping my purchase will fit..need to work out how to do a custom WB..