Blown in insulation

Is it worth having blown in insulation in the walls? Does it get everywhere? Under the windows? I've seen new construction on TV where they put up plastic mesh over the studs and fill the walls with blown in insulation. Is this the same stuff they use in old homes?
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Blattus Slafaly ? 3 :) 7/8

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there is a fiberglass that is blown in with a latex spray on it that stays suspended , the paper blown in stuff settles alot. getting it inside the complete cavity depends on the experience of the installer.
http://www.minibite.com/america/malone.htm
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