I've got a two year old CS-370 w/ 16" bar and it has been a great saw. Starts every time on 2nd pull (1 pull w/ choke closed, 1 pull w/ choke at 1/2). It's compact and lightweight and definitely outcuts its 37 CCs. I can lay it on an oak log and it will pull the full bar length through it under its own weight like a much bigger saw.
I only buy ethanol-free gas for my lawn equipment, so I haven't had any of the carb/fuel line issues that others report. But, I can attest to the lean settings out of the box. The EPA requirements have all of the manufacturers setting their products lean - so lean, in fact, that some folks report burning up the jug in just a year or two.
Of course, I would never dream of doing this, but I've HEARD that if you remove the muffler, drill out the cat, port the exhaust, and retune the carburetor (since the increased airflow would now have it running even leaner) that a little 37cc saw will run like a stock 45cc saw. Hypothetically speaking, of course.
Wouldn't want to upset the Nancy Bloombergs of the world.