Just bought a CS-590-20 yesterday. I've been studying about them for a week or so & could see that was for sure the best saw for the money in that class. I've been using a MS-290 for 10yrs & it has been excellent and still is, have had no problems whatsoever. I have only made a few cuts so far, seems to be tuned perfectly, I'll check it out a little closer after awhile. I will have it tuned & modified perfectly in no time, you can bet on that. I'm thinking it might be best to leave the muffler alone for a little break in time. Not sure on that but I wonder if you don't need to keep some backpressure for it to break in right. Maybe not. I'm not gonna be cutting more than 2 cords of fire wood per year most likely & I'm not physically able to do a whole lot by myself but I have 3 good saws now that will cover anything I need to do. (MS290,CS-590 & MS-250). Would love to hear anymore details others have with this saw. I've been a die-hard Stihl fan for yrs but I'm trying to learn about the major 3 brands now as I'm setting up a Hobby/repair shop for chainsaws now. Next thing on my mine is to decide which Husky saw fits this class and maybe get one to try. I'm thinking it might be the 359. Anyone know? Would it be the competitor to the 290 & 590 ? Sorry for the long post. Larry R.