I am travelling from Sydney to Siem Reap via Ho Chi Minh city in September and return. I have come across an upgrade company called Optiontown (optiontown.com). I've never heard of the company until now, but have read that after paying a small sign-up fee the company may be able to secure seat upgrades at very low prices (paid upfront). The site also says that if the upgrade does not come through, your money is refunded in full.
After doing some research, i have read many positive and negative reviews of Optiontown so i wanted to see if anyone has had any experiences they could tell me about, especially and mainly using Optiontown with Vietnam Airlines.
Any information would be greatly appreciated.