I have had good success with Jet. I bought my two 1070's from them, and then an Acer Z35, which I requested a return the same day I received it after having tested it out and not liking, which was promptly approved. Once that went through I ordered my current X34 which arrived two days later.
I got a full refund, no hassle. I had taken all the protective film off the monitor, but packaged it back up as best as possible as I received it. Would I use them again, I guess it depends on how much I am going to save.
YMMV