I run 420m for 2 season, but due to recent events, I only have one back pack. With all the talk lately about red max over stihl. If it wasn't for this site I wouldn't have looked at rex max. The dealer I went to sells both. I looked at the two of them side by side and don't see what the talk is about. I talk with the dealer and he told me about one of the problems. with a hour drive from my home to the dealer. The choice was easy. One was very big it seem to be 4ft thick and heavy with the other very stylish and rounded thin to my back and so powerful. I will tell you all about it later.