I been riding the D209 GPA EU one and they work well. I pay almost 400 for those. The set I am on I just use it for my 4th trackday. I am going to see if 5th trackday is possible. I hear the same about how good the NTec is. I wonder if one can run those tire 4 to 5 time for trackday use? Would like to hear your test report on these tires.I have heard/read elsewhere that they have incredible grip and last longer. I hope they deliver. Testimonials?