Did a lot of research and it was confusing to try to figure out which one was the best buy but chose this one because of the automatic oiler, digital battery charge readout, extra chain and bar and two batteries. I finally got the chance to use it today and it works like a champ! It really DOES cut thru 3" wood in less than 7 seconds!! I cut quite a few pieces of various sizes. When I was done, the battery charge still read 100%. It had used half of the oil in the reserve but no leaks!! It only holds about 2 oz? of oil, so that's no problem. The shipping was incredibly fast, too!! It's so easy to use - very happy with that, too.