Hi, I've been researching many different forum solutions and have currently boiled it down to Vanilla Forums, IPB and XenForo.. XenForo is definitely at the top of that list but (as with the other ones) I have some worries. First, for all the themes I've seen available for XenForo they pretty much ALL seem to follow the exact same wireframe, leading me to believe that the templates themselves are either not very customisable, or customising them would break integration with certain backend features so people opt not to do it. Can anyone enlighten me on this? Second, and this is more a question than a worry, I am looking to use Wordpress as the main repository for users to login and register, I then just want to carry over that session to XenForo. Now I'm a senior developer with years of experience in web development so I have no doubt I'll be able to pull this off.. but I'm wondering whether XenForo itself offers an interface for SSO, or whether I'll need to basically hack my way through? In either case, can anyone inform me of the complexity involved in doing this? And last, I'm looking for a solution that can scale well, the project I'm on will likely have thousands upon thousands of visitors (millions if all goes well, but they might not all visit the forums) and I'm simply wondering how XenForo can scale with such large communities. Seeing as it's a rather new project I would imagine that scalability might not be on your radar yet. Thanks in advance for anyone taking the time to read/answer my questions.