Hello,
At Nevada State College we are currently running OCLC's link resolver alongside Serials Solutions to assess the possibility of switching to OCLC to reduce costs.
The transition was essentially as difficult as I expected it to be. Most of the major databases ported over easily with a large holdings file upload. Individual journals subscriptions were sort of sporadic. I had to check most of them individually to make sure they matched correctly into the OCLC knowledgebase.
If you profile e-books in Serials Solutions, I would recommend setting up holdings feeds from each e-book vendor directly into OCLC rather than loading a file of your e-book holdings from Serials Solutions into OCLC. The holdings feeds can be delayed (by as much as two weeks), but they are more accurate than what you will get by uploading a file to match into the OCLC knowledgebase.
I echo Barbara's concerns about interface customization with OCLC. The out of the box view is basically what you get. I will say that in terms of accuracy of actually linking from a citation to the full text, in my testing so far both products have come out about the same.
-Tiffany
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Electronic Resources & Discovery Librarian
Nevada State College, Marydean Martin Library