Picked up a new 555 today with no bar or chain. My local shop matched the best online price. When I got home, I just had to try this thing. During high school and college I sold many Husqvarna saws...models mostly like the 350, 365, and the Rancher. I am no longer in the chain saw business but wanted a new auto tune saw. All I can say is wow with this. I found a 24in bar and chain in the garage and the 555 handeled it no problem. The saw dialed in quick and was very responsive. Cuts wood like crazy, cannot wait to break it in. Also note I started it alot today, both hot and cold, never had a problem.