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I noticed for one of my sites, a large number of links do not show up in Open Site Explorer, including some of my stronger links.  That being the case, how much weight can I put on using these tools to compare sites? I'm not trying to bash here, I really like the tools but if my PA is 29 and my competition is 34, how much weight can I put on these numbers? Or if it says my site has 50 links from 25 domains and my competition has 60 links from 30 domains, these numbers obviously aren't very accurate?  So how much weight can I put on these comparisons?  Are there better tools?