Handlebar coffee cup holder

Have been thinking about getting one of these for a while and finally ordered one on Thursday which the postman delivered yesterday. Its a coffee cup holder for the handlebar and its called a bar-ista :) Not sure if this is the best mount position, best mug or how well it will work in practice but I like the idea of being able to take a mug of hot coffee on my ride to work in the morning. (My insulated mug looks like it needs a good clean too).