Owner of the service I work for has a 562. My first thought when I saw it was, "what a weird looking little fake saw." I've been using it for the past few days, and it is lean and mean. For a saw that small, it really hauls chain around that 28" bar, and I mean hauls it.
I haven't had any hot carb/restart issues with it, but I definitely like the new power/choke switch technology they have on these 500 series saws. I like how the nuts over the bar cover can not separate from the bar cover, so you can't lose them.
The saw IS much more serious than I thought when I saw it sitting on our shelf. My only complaint is about the bucking dogs. They are so little, and they have that angled up bottom spike just so you absolutely cannot get that spike in the wood to pivot your bar. Made me mad, and I immediately thought they must sell a bigger set them separately for a lot of money.
I'm looking out for the 540. I asked my dealer about it, and he said his guy from Husky said they would be in around Feb. But I was also told that he had to laugh at himself because the release date has been delayed so many times already that nobody can actually depend on Feb. He really doesn't expect it to show up here until late in the year.