MCT's are intriguing. I've been reading up on them for a little while now. It appears that some of the initial research was conducted in the early 1980's (see Jeukendrup and Aldred) who studied using MCT's as a pre-exercise fuel. More recent research looked at its use during exercise and post-exercise.

Unfortunately, the research is inconsistent and skewed slightly toward a decrease in performance when using MCT's alone or as a blend, instead of using a carb-based fuel source.

However, what seems to be fairly consistent is that replacing some of the fats in your diet with MCT's may improve overall body composition and cholesterol ratios--in part due to reduced calories. But, the downside is that they do not provide essential fatty acids.