I haven’t used a modern Echo saw, but I have owned older (1980’s & 1990’s) Echo saws, and other equipment. My summary opinion, which might only apply to that vintage, was that my Echo saws were every bit as reliable as any Stihl or Husqvarna, but the performance and ergonomics were both poor.
My last Echo, a 510 EVL (“evil”) started every time I needed it, but it was heaviest damn 50 cc saw I’ve ever handled. Also, the chain brake lever was too close to the handle to use with gloves on, and the filler caps for fuel and oil were way too small, and both hidden under the chain brake lever. It was impossible to fuel and oil that damn thing without a funnel or making a mess. Also, wood chips and sawdust would collect in the linkage behind the air filter, causing the throttle to stick open, if it wasn’t cleaned out at least a few times per year. So, you’d finish a cut, and the saw wouldn’t idle down, the chain would just keep spinning. After opening the air cover and blowing out the linkage with compressed air, it would work fine for another few months.
Maybe they’ve improved in the years since, but when I check their power/weight ratios, it seems they’re still way behind Stihl and Husqvarna.