I've used the Trucker Co's on my Maguras and they have been OK. They are not awesome, but they are cheap. I did have one set that crumbled apart pretty quickly, but the others have been good.
The discobrakes pads are largely excellent. If they've got them for you type of brake, the ceramic pro pads are awesome for bite and fade-resistance (just as good as the EBC reds but 1/4 of the price). The kevlar ones are good too, but the ceramic pros are better.