As far as Echo goes, we've worked on several sold by Home Depot, and it seems once they have a problem, they can't be fixed. We have a great mechanic that has no problems with his repares on other saws, but the Echos just won't stay fixed.
Dolmar - Don't forget who owns Dolmar. That blue Makita is the same saw, and they do a great job. Husky and Stihl are just the two biggest saw companies in the world, thats why so many Arborists use them, not because they dislike the other brands. I don't know of anyone who owns a Dolmar or Makita that is not satisfied with it 100%.