The M220 is basically an update to the eMeet M2 (which itself was an updated to the eMeet M1) that includes two M2 units but it adds the ability for the two included devices to be daisy-chained together. This daisy chaining allows you to use the M220 in larger rooms with more people. You also can use a single M2 if your particular needs only require one, so it gives you a lot of flexibility. Each device includes a cable lock connector, audio in, audio out (for daisy chaining the two devices), and micro-USB input (for charging and connecting to computer via USB).
I really liked the design of the M220; it is modern and sleek and would look great just sitting on a desk. The buttons on the device are not physical push buttons like on the eMeet M1 but are instead capacitive touch buttons. They work well but can develop some smudges. Both of the speakers are provided with soft padded storage cases to help keep them safe.
The M220 gives you a LOT of different ways to use the device. You can connect directly to a phone or computer via bluetooth, or you can connect it to the computer with the included Micro-USB cables. They also include USB audio adapters (called the eMeet Audio adapter A200; they give you one for each speaker) that you can use to wirelessly connect to a computer that might not have built-in bluetooth capabilities. I tested each of these different options out and they all worked well. For use on a computer, I found that either the USB cable or the A200 adapter worked best with Skype for Business or Skype; it could be a challenge for me to get Skype to work will via bluetooth only connection (but I think this was more of a Skype/Windows configuration issue that any problem with the speakers).
Audio quality was very good both as the person in the room with the M220, as well as the person who was on the other end of the call. Phone calls and Skype calls were loud and clear. For the person on the other line, they could tell that they were on a speakerphone as I did sound further away from the microphone, but they did say that they could still hear me very clearly even when sitting several feet away from the microphones.
In addition to being able to use this as a speakerphone, you can also connect the speakers via audio cables (two are included) to a sound source and use it as a regular speaker. The only feature of the M1 that I don't see in the M220 is the ability to use the M220 battery to charge devices (phones) via USB. It was a nice bonus feature for the M1, but definitely not a deal breaker by any means for the M220, and I think all of the additional features and flexibility afforded by the M220 outweigh that minor issue.
Pros: Attractive design, easy to use, lots of connectivity options, USB and audio cables included, digital assistant capability, flexibility to use in small and larger groups/rooms
Cons: Capacitive touch buttons prone to finger smudges; cannot use as an external battery to charge cell phone