anyone got experience of this make of chip for a td4? or any other car? they seem expensive,compared to rover rons synergy 2

ok.no answers,anyway i won a tduk chip on eblag for my td4,fitted it today and what a difference,i also have the egr bypass kit fitted,so i think that helps,engine a lot smoother,less gearchanges,which is good as it a bit hilly on the island lol,and i only have it at the middle position,well chuffed,oh and no black smoke,the guy said he paid £300 for it less than 2 years ago,i won it for £60 bargain!!!!!