I found a 346xp today with an 18" bar with replaceable tip for $479. Now, here's the thing, I can get it for $464 in the box. The lower price does not include assembly, adjustment, and filling with gas and oil. My question is, is it worth paying $15 more, or is this "adjustment" just a load of bologna? Is there really any adjustment needed, or am I just paying extra so they can bolt on a bar and put a fluids in it? Also, if it does need some kind of initial adjustment would this be a simple procedure I could do myself, or is it better left to a trained technician?