I have no wonder how this brand is not counted as a premium one. These tires are awesome, I changed my Contis for these, and feels far better in terms of comfort, quieter and smoother as well. The grip levels are very good in all conditions, I cannot mention any drawback compared to the Conti.
Regarding the lifespan, I drove about 10000 miles on this set, on the fronts can notice some wear, but I have an FWD diesel car, that's normal. I guess this set will do 40000 miles for me with rotation.
So all in all, I'm satisfied with these tires and happy to chosen instead of well known premium brands.

