I have Weitec GTs on mine. I gave them a thorough testing across the North Yorkshire Dales national park the other day. This will of course be very different from a super smooth racetrack but for the money, I don't see how you can go wrong.
Damping from these is superb and body roll even on aggressive cornering is reduced to pretty much zero. I have a standard ARB setup with polybushes and handling/roadholding is at a completely higher level than the standard Cupra or Cupra R cars. Breakaway is very neutral and compliant, you need to be very stupid to get the car to let go.
Its very important to get these set up by somebody who knows what they're doing. Don't expect to bolt them on and instantly transform your Leon into a racecar.