I bought the CS 3510 yesterday. Ran 2 tanks of gas through it today on red cedar. Can't get over how crazy light it feels in my hands. Have worked mostly with 50 & 60 cc saws.
Feels a little "cheap" in some ways, but I guess that comes with being made so light.
Noticed a slight rattling noise at idle. Probably making the noise at throttle too, just can't hear it over the engine. Maybe they all sound that way.
Dies now and then at idle. Will need to be tweaked a bit. Maybe that's because it comes tuned for 50:1 fuel and I run 40:1.
So far happy with my purchase.