Zuji is offering a $50 Zuji voucher when you book any flight with the exception of Tiger & Scoot.
I recently used Zuji to book a flight in the US which saved a bit as it charged in Australian dollars, found a very cheap flight, plus got a tiny bit of cashback. But let's look at recent airfare deals, using a CC and compare:
Los Angeles Return ex Melbourne $705 with Fiji Airways via Zuji - Unfortunately expired but that would have netted you the $50 for a $655 flight (or $646.54 with cashback).
QANTAS Return Chile (Santiago) & Brazil (Sao Paulo) ex Bris $953/$973, Melb $966/$969, Syd $977/$983, Adel $982/$988 @ IWTF - Bestjet at $981 but site didn't work and not as trusted as STA travel which has it at $1016.
Zuji: $1048 - 1.2% cashback ($12.57) - $50 = $962 (effectively).
ZUJI Flight Servicing Fee: Domestic $20.00, NZ/Pacific $40.00, International $0.00 per booking.
So I'd say don't use this for domestic or NZ/Pacific flights unless the price is very similar.
For example, Melbourne to Canberra(where there are only 2 airlines) brings up a best price of $316 from cheapoair (charged in USD) or directly from Virgin for $350. Zuji comes up with $377 inc fees so - $50 = $327. May be good if you don't want to deal with a lesser known site charging in USD.
T&Cs:
Visa Checkout: Offer applies to any flight booking made at www.zuji.com.au when you pay using the Visa Checkout payment method on the payment page, from 9:00 17 August 2016 - 23:59 31 August 2016, for any departure date. To be eligible, you must book flights and pay with Visa Checkout. Mobile site bookings are eligible and holiday package bookings are eligible where flights are included. No minimum spend applies per booking. Offer strictly limited to one voucher per flight booking. Vouchers can be used on www.zuji.com.au. Some exclusions may apply. The voucher will be issued via email to the booking contact within 5 days of booking a flight. Excludes any itinerary containing Scoot, Tigerair and car hire. The expiry date for all vouchers issued as part of this promotion will be 31 August 2017. Offer can be withdrawn any time without notice. We reserve the right to cancel any ZUJI voucher that has been issued against a cancelled flight booking. ZUJI is the sole promoter and as such all inquiries in relation to this promotion must be directed to ZUJI’s Customer Support Service. ZUJI’s standard booking terms and conditions apply.
Voucher is available with any flight. See comment.
Does it need to depart Australia?