Hiya. I bought a return flight to New Zealand from Travelup last year, as like you, I found their price to be the cheapest I could find. I did not know when I was coming back so I wanted a ticket that I could change the date on. The reason for going with Travelup was that they assured me on more than one occasion (i repeatedly checked as this was very important to me) that my chosen airline allowed one free date change and after that it would be £75. Great - got to New Zealand through Travelup, tickets were issued promptly, no problems...until the time came for me to change my return date. The airline said they did not do free date changes and if I wanted to come home on a different date I would have to upgrade my seat. I of course tried to get in touch with Travelup, their response took a while in coming and was very short - denied ever saying anything about free dates changes and when I asked if they recorded phone calls I never heard from them again. So, cheaper they may have been to start with, but I ended up paying just over £200 extra to get home. I would not use Travelup again or recommend them.