I bought the FS90r and it has the Autocut 25-2. Fairly easy to load and works decent. I then tried the Auto Feed Head that stihl makes. It works great as long as you are ONLY working with nice grass. If you have any tall weeds at all or lots of trimming to do along curbs, or roads..I don't recommend this head. It doesn't hold as much line as the autocut 25-2, and it will feed to often. For those who edge with a trimmer, it doesn't work well either, because it will feed line when you are not expecting it, and mess up the edging. In tall growth, it will dispense way too much line and end up getting tangled. I just purchased the Oregon 450 speed feed head, and will be trying that next...we shall see.