For anyone who has moved from the previous versions (816/915) to the newest (818/917), what differences have you noticed, positive or negative? I have hit both new versions myself, and did see and feel some obvious differences, but am interested to hear what others may have noticed. I had an 816H, but ordered an 818H which should be in my hands next week. I may pick up a 917F to replace my 915F 3W too. (Or maybe I'll wait for the 919F, which should be out soon, I think.)