According to many, Shapton glass stones are the absolute best stones on the market. They remove metal very efficiently, and the stones are very hard. The hard ceramic wears down very slowly and therefore does not need to be particularly thick. The stone consumes minimal water and is of the 'splash & Go' type, which means you don't soak the stone in water before use. Instead, you pour a palmful of water on it and start sharpening immediately.
We give Shapton Glass Stones our warmest recommendations. They are superbly good stones.