I have found that although the downy woodpeckers and the Northern flickers will eat the blocks of suet they seem to much prefer the round tubes in the log. I go through 4 -8 logs in the time I go through one block.
The downy woodpeckers are very similiar to the Hairy Woodpecker; except they are much smaller. The downy woodpeckers are much the same size as my pine siskins and sparrows except for their long tail feathers.
They are fun to watch and listen to. Although they don't "sing", their form of song is to hammer on trees or metal poles. When I watch them pound on metal poles I am reminded of the woody woodpecker cartoons where the beak would soon be in the shape of multiple "w"s.
Maybe someday soon I'll have my camera in hand when the male appears.....