Skyclub is a flight booking agent I regularly use for long distance business flights. If you have ever had to fly for business reasons you will know that quite often your plans change and you need to make complete changes very last minute. This is why it is always a good idea to get a booking agent that can do this.
The reason I use Skyclub is they have been able to do this for me several times in the past and it has only ever taken one phone call. Skyclub are also very good at negotiating the cost down with airlines on flights or when itinery's have been suddenly changed. Therefore the service far outways any small cost of using a booking agent rather than a flight comparison site like cheap flights.
I mainly use Skyclub for my long flights to places like USA, Singapore and Australia. For shorter flights I am more likely to sort it out myself as I can book these easily over the web and don't always fly Premium for short flights.