I picked up the Stihl string trimmer Kombi attachment to retire the consumer Husqvarna string trimmer model I had been using heavily for anything from brush clearing to edging for the past 3 years. I was concerned with the Stihl at the store since the head was designed like the Homelite string trimmer I bought when I first bought a home. I thought, it is a Stihl and should work fine but should consider getting the "C" model though it was designed somewhat the same way. I was thoroughly disappointed in the string trimmer head. I replaced the vortex style trimmer line which came it with regular Stihl trimmer line after I had to stop to fix the line. I was first annoyed that you have to cut the line in half and was difficult to refill the line since you couldn't spin the spool in your hands with the Homelite-like design tags and notches for bump feeding. After stopping 3 more times to fix the trimmer line, I brought out the Lowe's Husqvarna 125L out of retirement and filled it quickly with trimmer line. Even with the cover and bump worn through, the plastic trigger split, the shaft rattling, and the engine smoking at the end of the job, I didn't have to stop once and was able to finish quickly, and it was a decent-sized corner lot of a new customer who hasn't been trimmed and edged in years -- I had to shovel dirt out of the street gutters. I noticed all the professional models the store carried except one came standard with this head. I'm still scratching my head why most of the landscapers in this area use these string trimmers designed like a Homelite. Are they replacing the string trimmer head with the autofeed or the "C" head? Which one should I get or should I get some other brand head attachment?