What have you guys found to be the lightest commercial trimmer? I liked the Kawasaki KBL 23A. At 9.1 pounds it was easy to trim for hours on end without my arms aching, but they stopped making it for some stupid reason. After using the Kawasaki, everything else feels like a chunk of heavy concrete after a few hours, especially to my female employee. I find that extra pound or more really makes a difference. I don't know why I would need a motorcycle engine in my trimmer. I'm using it on grass, not as a brushcutter. If I wanted a brushcutter I would buy a brushcutter. I guess it's just a sales tactic to throw larger and larger motors in these things each year to get us to think they are the latest and greatest. What do you use?