I have been contemplating the transition for a while, Disc breaks definitely have a stopping power advantage over normal cable, shoe, I used a mates bike the other day and wow, is all i can say. Discs have various pad options that give you options for weather and terain, and do not damage the rim.
But they are more expensive to run and maintain, it takes more than just the average Joe to do any repairs and adjusments, and then there’s the compatibility of your current bike being disk ready.
My Scott came with disc ready hubs and connection points and still I’ll have to use adapters on the front Manitou forks. I’m looking at spending about R2500 about 200/pounds for front and rear. My conclusion is that when I have the spare cash I’ll go for it.