Well I haven't had a chance to use their larger saws myself. I was just in at my local Stihl/Husqvarna/Shindaiwa dealer last week and got to talking with the shop foreman about the good luck we have been having with the 488's they sold us years back. I asked them why they didn't carry any of Shindaiwa's larger saws (they carry the 360,377,488). The foreman and the shop owner both told me that the larger saws just didn't have the reliability of the smaller saws and couldn't compete with the larger Husky's and Stihl's. They mentioned that the saws tended not to have enough cooling capacity, but nothing else in particular. I can get more info if there is a particular model that you are interested in, the shop foreman has always been real straight with me.