Hi I have a Stihl FS90R and have just purchased a new Autocut head so I didnt have to dissassemble it everytime I re-strung the unit. However after about 2 days of use I have decided to return it and buy a different head. First of all, every once in a while, I have to stop and take it apart because the string inside gets tangled. Kind of defeats the purpose of a quick head! The second day I had it, I broke a tab which fasens the head on. Out came the original head that I got with the trimmer- they say if it aint broke, dont fix it. People before have recommended the Shindaiwa Speed Feed. Is this going to be more trouble than it is worth or is this the greatest thing? Any comments on all of this?