First, I know Opera Mini isn't a browser that you will see around very much, but... This site has huge issues on Opera Mini, I have tested it on a couple phones with the same result.

Pretty much, pages often never fully load. First click on a thread just brings a page with just the mustangforums logo, reloading adds the navigation bar, reloading a few more times shows the ads, a few more and the whole page will show.

Since I know MF is on vbulletin now, I know there is a WAP friendly skin you can just drop in. The bandwidth isn't an issue, but the number of reloads is just time consuming. I guess it's more of a feature request than an issue, eh...