Some of you guys need to get off of the 2-stroke trimmer is better theory. The four strokes are where your going to have to go in a year or two! Yeah, I readily admit that they're much heavier. However, the power is insurmountable in comparison to a 2-stroke.
I have used Stihl and Echo's top of the line trimmers and neither compare to the power that a Honda has. I have a Honda 431LT and am in the processes of buying another because of the efficiency at which it runs. Don't have to worry about extra cost for oil to mix your fuel, don't have to worry about having mixed fuel with you, don't have to mix the fuel at all. The tank on a Honda seems to last longer without filling up too. Just go to the gas station or use the gas tank on your trailer and fill it up!
The Honda trimmer is very, very quiet which is becoming another restriction here and there, noise ordinances. I have hardly had to run my Honda above half throttle when trimming thick grass or brush. I chopped a lady's plastic realtor sign in half last week when I hit the throttle hard trimming around it...Oooops!
I recommend if you get a chance, find your local honda dealer and see if they'll let you use one for a couple days, you won't go back to your old trimmer because of the convenience that the Honda has. Give it a try!