This gets around a big problem that a lot of users have had, namely that of switching between users when more than one phone is in the car.
The latest multipoint kits are ideal if;
You have 2 phones, one for work and one personal.
There are 2 regular users of the car who are often in the car together each with their phone.
You're sharing the driving with someone.
The first kit to support multipoint is the THB CC9060