I have had several bigger bore saws for several years, but pretty much forgot about them. A little over a year ago bought a 070. Had a few problems working all the issues out, but now it is working very well. Pulling a decent 404 chain is amazing. I cut two cords of green Oak and some Fir with out touching the chain. A slower chain speed will do that. At this time I have a 070 075 076 and want some more. Using a saw with more than 85 CC cuts way different than a lighter saw. Now have to decide if I want more kits or another 070. A 660 is lighter more powerful and has faster chain speed. I do not like getting up in the morning and spend time on a saw that might not last the entire day or week. Thanks