The Echo SRM 520 review: cutting extra long grass and small trees using the forestry cutting blade. Initial findings are positive: the harness is ergonomic and allows hours of heavy work. During this review I was using this device for 2 weeks of everyday use and can find no real downside. Yes, its loud and it consumes more petrol than less powerful tools, but its well within the limits. I can recommend the Echo 520 SRM as suitable for professional use. 5 year warranty and 3 different cutting accessories that come part of the kit.