I had Conti GP4Seasons on my bikes for a couple of years. They're tougher than any tire I'd tried previously and tough is what you need around Atlanta (
a suburb of hell). They'll go through all kinds of road debris and trash without a problem. The only reason I switched to something else was the price was getting ridiculously high -- $80 per tire.
FYI: I switched to Vittoria Rubino Pro Tech last March. Only $35-$45 per tire and almost as tough as the GP4Seasons.
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The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.