Need string trimmer info

[I have MM2000]

I do not see where one might post for string trimmers. Yesterday the third B&D GH900 died on me. I complained the last time to them and they offered me a free one. I should have taken it. I just want them to make them better. This one also died in less than 150 hours of use. They are great until they die. Does anyone have any experience of electric trimmers that last?