I dunno....... maybe in Ohio, an autotune will be fine....
here in Denver from 5280 to 10,000 feet (at the high mountain pass areas), AUTOTUNE Husqvarna and Stihl M-tronic saws just downright suck. Tons of saws that fail to start when hot, won't run at different altitudes, and dealers so frustrated that they don't know what to do. Brand new saws, less than a week old, are not uncommon to see at the dealer for service related to the self tuning carb systems.....
I have sold lots of adjustable carb saws to pro arborists, and one owns a Stihl MS362cm...... he is in process of selling it because it has been in and out of a good shop more than he has gotten to use it
My suggestions:
If you have bigger bucks to spend, go with a Dolmar 6100
If less than $400 is your budget, find a 6400 Dolmar/Makita (although a little heavy for a mid-60cc, you could always push it up to a 7900 when you got the chance)
or the Echo 590 does seem to be a great deal as well. I helped a friend who had just bought a echo CS-400 and he was cutting 20+ inch hardwoods for his wood working hobby.....
I told him to see if Home Depot would take it back, even if nothing was wrong with it. They did let him return it for full credit, and he got the CS-590 on sale for $325+tax. I promptly picked up a Stihl RS round chisel chain for him and he loves his big new saw. I told him it should last virtually all of his life if he maintains it (or likely has me maintain it for him) and uses good ethanol-free, synthetic-mix oil fuel.