Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't even think about respooling!

If you're mechanically inept, like me, don't pay any attention to the review that suggests buying line and respooling it yourself. If you try that, I suggest using protective gear when you turn the trimmer on as the spool may unwind for several feet before tangling up, cutting everything in its path including you. (This statement comes from experience!) I've had my Toro trimmer for several years, replace two or three spools every year, and never had a problem with it, or with replacing the spools.