There are exactly two mobile VHF/UHF-D-Star Radios on the market: ID-5100 and now ID-4100. I really can´t understand what´s so hard to follow why they brought an ID-4100. There are people on the earth using repeater stations when driving around instead of using handhelds with LTE/mobile-connected hotspots. They are now able to chose between big display or small display but great useability. The former ID-880 was just horror to use without a manual. The ID-4100 can be used very easy because there´s much more place for options on the display. If you want it nice, simple and small....the ID-4100 is the right one! More room available....use the 5100. So what...?!