The ease of use for both our customers as well as ourselves! It's a great tool to have in your arsenal when you're out at events or conferences where it is difficult to get connected via phone/Skype etc.
Not many other options available if internet isn't working properly (or not accessible). We've been able to connect clients from all over Oz who are unable access their office network due to power cuts / storms / floods - which can be very frustrating!! Also good way to keep everyone on track during meetings too.