I have a couple Huskies (455 and 460) and have been using my Echos more in the last few years. The new Echo CS-4910 is light, durable, powerful and cuts well without the higher price of the 501P pro saw. Home Depot sells them. I was very pleased with how well the chains hold an edge between sharpenings on the 501P/490/4910. If I ever have to grab an 18 or 20 inch saw I am getting my 501P (for large trees up to 24" or so) or muffler modded 490 (anything 20" or less). I do have an even lighter Redmax 18" that is very handy for limbing (especially if you are doing it all day), but it just does not compete with the speed and strength of the 50cc Echo saws.