It's very convenient, comfortable, and you don't feel like part of the heard. I often got sick flying on an airline (ton of germs on those things) and would be off work for a couple days - I can make the cost of a flight in a couple days if I am not sick - so thats my justification. Beyond that, being driven onto the taxi way and walking onto a jet on my schedule is perfect. We don't wait in lines, walk through customs or anything like that, in fact, customs usually comes on the jet.

Proof/My business partner and I - http://imgur.com/NNT96Ap