Paying for that is better than paying for the full software though, no? And that's only $8 a month, with other features included as well. A full software, like XenForo, is lots more.
Well its a free forum host, its really not a software, so you dont get full control over your forum.. I rather pay for forum software then pay to have it hosted and not have access to the files. ZB's features are no way close to xenforo. Thats taking it too far lol.