I am riding on continental grand prix 4000s tires right now (i assume this is what you mean by gp4?). I have not tried the tires you have. However i have loved these tires. They are puncture resistant ( no flats since i got them last summer), durable, and seem to have a low rolling resistance. What i really like about them is the grippiness i get, even in wet conditions, in cornering. I don't know what your tires are like to ride on, but when they are actually worn, consider these as a replacement. Also They are pretty sexy in all black with the low key gray logo.