I gave my new 455E Rancher a good work out over the weekend. I have a 20 inch bar on it and was pleased that it had more than enough power for that and with the adjustable oil pump was able to keep the bar nicely oiled too :-) It starts and runs easily and you can work for quite a while on a single fill of fuel and oil.
I was only cutting Sycamore and and although they were big, I guess Sycamore is not the hardest wood to cut through but so far I'm happy. For the smaller stuff, its not surprising that that I prefer my little Stihl MS 180 with a 14inch bar since it is much lighter and just more appropriate but its sure nice to have the option of something a little bigger and more poweful.
Adam.