vb Blogs - Worth it?

I'm on the fence about picking this up for my new site after selling off ss.org last month. Do any of you guys use this, and if so - how has your member reaction been to it? I like the functionality and the overall idea, but I'm not sure that my members will actually use them. So for you guys that took the plunge, what's the general reaction been to them?

My last two sites have had 30,000 and 10,000 members respectively, so I'm expecting a decent turnout on the new one as well. There are just so many alternative blogging methods out there, along with domains and hosting being dirt cheap nowadays that I'm not sure my members would actually get into them considering that you can blog on your own domain for less than $50 a year nowadays.