I have to say I've NEVER taken any of my saws back for repairs but then I'm capable of fixing any issue that may arise.
it's a know issue that Echo has fine debris issues with their OEM flocked air filters but it's an easily fixable issue with either the addition of 2 common sized 'O' rings or complete removal of the OEM air filter and the install of the 'Red Beard' velocity stack and oiled foam air filter (which is what I did). The cheap way around the issue is of course, the addition of 2 'O' rings, one on the intake stud that secures the air filter and one over the intake snout. That eliminates the fine dust issue with the stock, flocked air filter entirely. In my case, I went with the Red Beard aftermarket setup because I've always like oiled foam air filters, just a personal preference but both fix the issue.
The other underlying issue is Echo's penchant for additional baffle plates in the exhaust. Like Stihl, they like to add additional baffle plates to curb the ignition noise so I removed the last baffle plate entirely and opened up the muffler a bit as well and that really woke up the 590. Sure it's a bit louder but I do own it so that was my choice entirely. I tend to wear ear protection when running any saw, anyway, along with proper PPE.