Hey buddy,I love my 535,its going on 5 years now,I think it has better low end power,but the 240 is probably just a little smoother running at higher rpms....I also have a 525 commercial,its a nice trimmer also, and light weight.....I average around 35 to 40 gallons of premix between my chain saws, blower, and my 3 weed eaters a year.....