Thanks for the comments guys
I really like the version of the forum software that w7forums.com is running, so I wasn't keen to change it on the win8forums.com website. However, because this forum software has reached the end-of-life stage, I didn't want to start a new site using it (w7forums.com will continue to use this software, as it works great).
If the new forum software turns out to be unpopular, I can easily move back to vBulletin - however, I think it's worth trying out. It's taking me time to get used to it, but there are some big advantages and clever features

.