Yeah those SpeedFeed heads are the dog's bollocks. Was lucky enough that the Shindaiwa T230x that's my main trimmer came with one. Is a dream to use and I'm reminded how vastly superior it is whenever I use someone else's trimmer.
On a sidenote, must say Kawasaki make great trimmers, picked up an old KBL23A from an auction for $10, pulled it apart for basic servicing, started first pull like new. Jumps ahead of my old Echo as my 'backup'.
