Looks like the were manufactured by KW Automotive, I had KW Clubsport coilovers on the mini and they were just awesome but as expected the were quite firm on the road as mostly track orientated. The innox coated threads were amazing though, those coils had seen quite a lot of salt and scrubbed up so damn well.
Having been driven around in similar cars running KW V1 & V2 they were much more road orientated and quite soft (V2 you could firm up the damping though). Depending on which ST your looking at the one with the fixed damping (XT) sounds similar to the KW V1 and the rebound adjustable ones (XTA) sound like KW V2 with top mounts, but both without the innox coating.
Really, when looking at coilovers you should be asking what your looking for out of some new dampers really? Depending which coils you go for, and what you want from them, you might not actually be uprating what you have and could ruin your enjoyment of the car. Be wary of very cheap Chinese coilovers, look at the price and workout 1/3 of that. At best, thats the cost of the materials/manufacturing so they are pretty damn shonky 95% of the time.