My ego trimmer with rapid reload head never works! The string constantly breaks off leaving me to manually reload it every time I use it,this trimmer was a gift and isn't any good,I wish I could return it or get an upgrade to a better trimmer.
Actually, Ego's 15-inch trimmer is a fantastic tool, you just need to fine-tune how you're using it.
The string that comes with the trimmer is a bit brittle. If you're trimming against concrete or something else solid, like a fence, back the trimmer away a bit, and maybe slow the speed. You don't need to go full torque on everything. That said, my main recommendation would be to replace the string with something less brittle. People here have had great success with Echo and Husqvarna Titanium Force line. (My personal preference is the Husqvarna.)
Just be sure to get the correct diameter --- 0.095.