Can anyone vouch for GX tuning Store UK?

With my teammates we are looking into getting a kart for cheap in order to get a lot more mileage on the cheaper side.

So the idea would be to get a used chassis and a 4 stroke engine. Either we go full Tillotson, or we get a GX200 stage 2 and OTK chassis.

But can anyone vouch for those tuned GX engines ?