In the amateur radio digital world I am a fan of Yaesu System Fusion (YSF)…
I have a Yaesu FTM-400 mobile unit at my home which serves as my 2 meter/70CM “base station”. With 2 button pushes it can be switched to a YSF “Node” connected to “Al Gore’s amazing Interweb” through a laptop. This allows me to talk directly in any of the hundreds of YSF “rooms”. I can push 1 additional button and set it up to act as a repeater via my home antenna and provide access to all of the same YSF rooms using my Yaesu FT3D handheld or vehicle’s FTM-400 mobile radio.
Another YSF connection option I have is an OpenSpot 3. When I connect this garage door opener sized device to WiFi or tethered it to my phone, it allows communications access to many of the same YSF rooms. I can use it to talk in the YSF network with my home, mobile, or handheld radios. I can even make digital contacts while out hiking as long as I have a cell signal.
Lastly, there are several repeaters in my area which support YSF digital communications. I can talk to other local stations just like on an analog FM repeater, but the digital audio is much cleaner and static free. As others have said when in digital “voice wide” mode (VW), it sounds really nice with an audio quality almost as full as analog FM transmissions. When I switch to “digital narrow” (DN), my radios include my GPS position information in the transmission. The sound quality is a little more “digital”, but I can now see bearing and distance information to the other stations as they transmit.
Bottom line: I have used YSF to talk to stations all over the world, often on a handheld while sitting in my backyard or out hiking. It is an easy to use digital system and the number of Yaesu repeaters is growing daily. I would say it is the “up and coming” digital format.
Edmo