They not so bad when ya get like 8 or 10 under yer belt! LOL The 300 series just seem like a bigger brother variant after I did my first. Most of my "sophisticated" language got said when I did my first and 2nd and 3rd Stihl brand pieces of equipment. Kinda like this TS 420 concrete saw I have torn all to hell now just to get the carb off for a rebuild.... sheesh!