Summary: Several users at Northern Tool + Equipment comment favorably on its low-vibration handle, and a translucent panel allows you to check the chainsaw's fuel level. The chain tensioner isn't tool-less, but reviewers say access is reasonably easy with a wrench. That said, the 450 does have a few quirks. A few longtime users say it sometimes throws its chain, and can plug up when sawdust mixes with oil from the automatic chain oiler.
Pros: Fast, powerful, Relatively light, Easy to maneuver, Starts easily
Cons: Sometimes throws chain, Can plug with sawdust