I don't have the time at the moment to go into all the details (I will elaborate later) but the features I have used thus far are as follows:
Voice commands - almost everything can be done hands free
Intercomm - simple and easy to use
Smart phone pairing - easy to pair and use. I can answer and make calls easily. The units have a priority list that can be configured which means I can listen to music from my phone, get an incoming call that automatically pauses the music, finish the call and automatically resume the music. Same with using the voice navigation on my android phone. Fantastic.
FM radio - you can have up to 6 presets, or, if touring, use the automatic 'find' feature that will temporarily store the first 6 stations the unit finds, or, you can grab the next 6 stations by repeating the process.
Automatic gain control - all features have separate volume levels and all levels are controlled by AGC, which means the faster I go, the louder the noise, the higher the volume is automatically increased, and vice versa when slowing down.
Intercomm to phone - I can call a buddy using the intercomm and if he is not in range, will automatically call him using the phone.
Phone call sound quality - perfect. Flawless.
Battery life - we spent a solid 14 hours with the units on and had power left at the end of the day.
Flexibility - the units come with a variety of installation options including different mic and speaker configurations as well as mounting accessories.
In short, I cannot say enough about the quality of the units. If you are interested in buying a comm system for yourself, I would recommend looking into the Scala Rider.