I have not seen the sthil 4 stroke trimmers yet.I own a small honda 4 stroke tiller.The size that are usually 2 stroke.I really like it.But as far as trimmers go.I would not buy a 4 stroke yet.So far they do not have near the power of 2 stroke.But the second they do make one that have near the power I will buy one!I don't like the smell of 2 stroke and the pain of mixing fuel.I'm sure it is just a matter of time before they make stronger 4 strokes.<p>from:Adam<p>AB Lawn Care