No problem with a 2 m tall x 98 kg friend. He immediately felt at home on the Serenity, even with my big 10.6 sail. Same with a 2 m tall x 105 kg pal with his 9.5 sail. Uphauling, tacking, going upwind, reaching or deep reaching were all easy. Downwind and jibing were the most tippy experience, however.
Unless you're a beginner, go for it !