Who wants chalk all over their hand? Got this for a birthday present. A bit sceptical at first, especially the price of what is "a big calcualtor" It's so much more though! Once you get used to all the buttons, it becomes second nature. So much quicker than marking a board and it's great if you're on your own. One slight downside is that it doesn't ask you how many darts you finished on with your last throw, which means when you're checking how many darts where thrown in a leg; it automatically assumes you used you're last dart to finish. But really, that's a minor flaw and i just couldn't be without it! It also takes 4 x AAA batteries if you ever needed to take it somewhere that didn't have a socket!