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Visible page rank is URL-specific (check out a site that does not have the 301), but no way to know if 'internal' (real) page rank works the exactly the same way.
However, probably better to accept the link as is, than ask them to alter it; that can often lead to deletion!
Will I lose any link juice? Or not? Surely I shouldn't if the permanent redirect works?
Interesting question. I've not done any micro tracking of this but I have thousands of references out there with and without www. There doesn't appear to be any adverse effect.
Personally? I wouldn't worry about it too much. If you can get the originating source to update to the www version, great. If not, no big deal. The 301 is in place and according to protocol it should be seamless. Heck, Google even give you the option to specify this in WMT.
I do a bit of advertising these days without the www for display URIs. I can't see any negative impact from doing this. As long as you've got the proper 301s in place, you're good to go.
I think there are several distinctions to be made here.
1) cross-domain 301's: They are helpful in site acquisitions, but after seeing dozens in the past year or so, I have some serious doubt about the authority being passed. Keyword rankings seem to transfer for the mostpart, but I haven't seen the authority or weight convey in general.
For example, domain A has the general trust and authority to to rank in the first page within 48 hours for new content. After a 301 to domain B(Note Proper 301's are important -- /subpage-content-asdf -> 301 /most-relevant-asdf) the keyword rankings convey to site B, but the authority and ability to almost immediately rank for new content does not.
2) non-www to www within a domain: From my experience, these changes are seamless if done properly. Ranking and authority seem to be fully in tact within a month or so from case studies.
3) http to https within a domain: This is the one that's surprised me. Within the past 2 years, I've had a couple sites that make sense to be exclusively ssl leadgen sites because of sensitive data gathering. I almost expected no organic success on these domains, but we previously had link campaigns and continued to the http version. What's more, we were going from [www...] -> 301 [(no-www)....]
Sure enough, rankings came back to the first page for competitive terms with tens of millions of competing results indexed by google. Got to give some credit to google for this one.
I think this is a great topic that's often overlooked.