Booked both flights & a hotel through Zuji for a recent trip to the US - no problem at all with the flight booking & they were the cheapest (even cheaper than the airline's website), a very easy process. No booking fees or credit card fees which saved a lot of moula that I spent in the US instead!
Re: Hotel, had rung them after seeing a price online as wanted to check something, and was amazed when I was offered an even cheaper price than anything I'd seen online. I must admit I was suspicious and so I asked the operator the same question many times & even asked him to ring the hotel in the US to check if the room he was quoting me on was the same type of room as I'd seen elsewhere. He did this without hesitation and answered my every question without pressuring me. I did buy through them & everything was just right when I got to the hotel.
Would most certainly use Zuji again.