Avoid if at all possible.
I hope to never experience the dreadful experience I found in utilizing this service. It is virtually an extortion tactic where they hold your initial purchase until you comply to pay their extraneous fee. The fee you pay to their company is almost the same as the payment for your flight, and if you were allowed to cancel your flight before confirmation and receive money back, I find it hard to believe that there is a person out there that would stick with this company. I was extorted, don’t allow yourself to have the same thing happen to you.