Jet,
The corkscrew willow is a beautiful tree and extremely fast growing when it is young, but they have very brittle branches and like other willows make a miserable lawn tree as they age. The
Corkscrew isn't a long lived tree, but the trunks grow rapidly, and they do shed a lot of branches, and often the whole tree can come down in a storm. Not the best tree for close to a house.