[Lost in the 60's]

I'm not familiar with the Flex brand in this area. I bought a 12v DeWalt impact driver about 7 years ago and was never impressed with the power. After the batteries died, I bought a Milwaukee 18v and the power level about quadrupled from the 12v. Now I have the 1/2" impact, a circular saw and a speed ratchet. Looking at the string trimmer, but it's rather spendy. I bought a 4 cycle string trimmer 10 years ago, to reduce emissions from the 2 cycle, but WOW, that thing is heavy.