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Sig links generally get very little weight as threads fade down the queue (deeper into the forum structure/heirarchy). You are not going to get a whole lot of SEO benefits from them even if the forum (whichever one you post at) does not hide them from spiders (are they shown by default to guests?) or put rel="nofollow" on them.
They are very good, however, for branding and, depending upon the quality of your posts, for driving traffic.
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