I bought my Ksport 6pot 304mm kit from Ksport UK about 5 years ago so I can't say if the quality has changed since then.
My kit didn't fit well. I needed to file down a few mm off each lobe of their mounting bracket to move the caliper outward laterally so the disk was centered between the pads. I also had to trim a tiny bit of the dust shield.
I was able to install it before filing down the bracket, but the pressure on the pads was so high that the wheel barely moved.
That said, I've been running them for some 60,000 km without any issues. They still look good too. I'm actually looking into purchasing their rear kit with retains the OEM parking brake.
As for pads, I purchased my kit with EBC yellow stuffs. But they also offered AP, Pagid and Ferodo pads at the time. The pad type on their 6 pot kit is the same used in the Aston DB7 and the TVR Cerbera.