The post and subsequent conversation here about Habari are interesting. If you are capable of trying here it is. You also must read this from Chris J Davis.
Back in mid 2005 when I was considering to switch to a hosted solution I picked WordPress basically by reading comments, I think I made a good choice.
I do hope that Habari is not another Logahead. I'm pretty sure it won't be knowing the big names behind the project.