I have been using an Echo srm210 for about 2 years semi commercially. Great trimmer for the money, hate the line feed system though. Anyway, I just picked up an account that is 4 acres completely fenced. Took my son 3 hours to trim it out with the Echo. I have always felt the power was a little weak on it. What I am looking for is a trimmer with fair amount more power without getting a monster and spending $500 that will increase efficiency. It will become my main trimmer. I see a lot of Shindaiwa's around and am thinking that way especially with the new line feed head. Recommendations? Oh yeah, no longer partially commercial. Thank you.