The FK1+ has a much smoother scroll wheel and also includes a nice product information badge on the bottom; this features important info like model,serial, manufacturer etc. 2: There is no point in having such huge battery back up if it beats the comfort. Battery life seems fine and lasts my 1 hour runs or 3 hour walks with no issuesI have owned this for 3 weeks and and love the way the ear hooks prevent fallout and keep the sound quality, fixed and consistent. Ill wait for another offering from Steelseries or simply see what Astro has in store next. Sound is crisp and the quality for the money is terrific. I would recommend these headphones for the price. Le foto parlano da sole. I like this new style a lot but I do have some issues with the fit. The only problem is they are built so well they last so long so youll only get a sale every 18 months or so. on the box it said 20kl .