Pros:
This is a great unit for speaking to your passenger. It makes it possible to have a conversation while driving in the city. It's well built, water resistant, and seems it will take a beating. The boom mic and headphones fit snugly in your helmet. They will also pair with my phone, making it simple to listen to music or talk when riding solo.
Cons:
The units are sometimes difficult to pair, but you only need to do this once per ride. They work well for your passengers, but have a very annoying buzz when there is more than a few meters, or any object between the units. It wouldn't be great to have a conversation with another rider. Additionally, they are impossible to use over 90-100kmph due to other noise, so this wouldn't be useful on a highway. However, you could replace the headphones with in-the-ear buds and you wouldn't have this problem.
The wires and mic are sometimes cumbersome, and not easily removed. So, you just have to live with them there when your not using the unit.