I have started a 2nd Age campaign set in Umathela using... the 30th Anniversary Tunnels & Trolls rules.
The reason is quite simple: the campaign game that I have started is for the kids (ages 11 and 13) meaning I need an easy-to-use set of rules, flexible, with little to learn/memorise. I also own the 5th edition of T&T in French, and the differences are minimal.
The first session today went very well. I'll explain in another post how I have "HeroQuest-ised" the T&T rules to render them more compatible with the style of play typical of Glorantha.