I've been on Biznik for about three years. It can be a great community for networking sometimes. They are invested in making sure its about making connections and networking and not just self promotion. They can seem a little hardcore about it sometimes. They really like to promote that with their highest level paid account, you get great
SEO benefits and I think that's probably true.
I joined right after I started my business and I didn't find that Virtual Assistants were very well received there (that was 3 years ago though and I think attitudes have changed since then). I do now have a client who I originally met at a networking event from Biznik so it's been good in that respect.
Biznik is also good for finding events and other people local to your area.