I find Mintex not to bad mid range price pads ran them on track days in the Cerb and find them good for road work in the cooper S there will be better pads out there but for the price i don't grumble.
I'd spend the few extra quid for an OEM brand like Pagid, Textar or ATE, false economy with cheap brakes as they'll likely start squealing and not last as long. Last time I did the pads on my Merc I used Textar as I know that's what you get at the dealer, just in a shinier box.
I find Mintex not to bad mid range price pads ran them on track days in the Cerb and find them good for road work in the cooper S there will be better pads out there but for the price i don't grumble.