Powershell: Get Size of Child Directories

gci -recurse -force |
? { $_.GetType() -like 'System.IO.DirectoryInfo'} |
     select-object Name,@{Name="size"; Expression = {
    ($_.GetFiles()  |
    Measure-Object -Property Length -Sum |
     Measure-Object -Property Sum -Sum).Sum}} | sort-object -Property size