I've never used Bearflix. To my understanding, Bearflix is what Bearshare became after it was sold to MusicLab under blackmailing pressure from the RIAA. The same company (Musiclab) hijacked ShareAza more than once. Musiclab now owns a hijacked version of Shareaza. Musiclab took over Shareaza's original website, the original creators had to find a new site. The story is partially explained here Shareaza • View topic - The Story: Shareaza, iMesh, RIAA, and Recent Events

I'm not sure how Bearflix compares with the BearShare 6 & 7, unless it's simply renamed.

As I suggested, you can try the BearShare 5 beta which was equivalent to the BS 5 Pro of the time if you wish. Might also be interested to see http://www.gnutellaforums.com/344799-post7.html about changing connection cache.