We did the Adventure, and yes, saying the mud were treacherous is a under statement!. Just robbing you of power with every single peddle stroke. We did the Umko, but going down it was very slow due to the slippery conditions. We targeted a time of between 5:30 and 6:00 for day 2 - according to our times on previous Sanis - but ended up with 8:18! It was crazy! And scary. I could hear they money leaving my wallet with every crunchy peddle stroke!
Also, I take these Vac Bags every year. One for each days kit, and two for leisure wear. After a stage, put your dirty, smelly kit back in the bag and seal it. It's also great for keeping your clean kit nice and dry.