Just recently switched form the pads to the sheets. I'm using the pads for dry sanding on woods and using the sheets for wet sanding on acrylics. I'm leaning toward the using sheets exclusively once I use up the rest of the pads.
I changed from pads to sheets a while back and use then for both wet and dry sanding. I've found that once the get loaded up I can wash them out and let them dry and they are like new.