I'm a big fan of Bike Friday. I've had my NWT for over 10 years and have toured on it a lot and regularly commute on it. But I've had a lot of screwups over the years when I order parts from them. They're always very nice about it and make things right, but I've had so many screwups that I began to wonder if these problems happen often to others or if I've simply been unlucky.
My most recent snafu is almost comical. I ordered new tires and fenders. Though the website said they had the tires in stock, turned out they didn't. They got them in stock within 2 weeks and my order was finally shipped. When I opened my box, it turned out to be someone else's order. That person received my order, I was told. They e-mailed me a shipping label for the return and promptly shipped out the correct order. When I got the new box, I discovered that the fenders don't fit my older model NWT. The website said they would fit, but it turns out a different fender they sell are the ones needed for NWTs made before a certain year.
Other problems I've had in the past include sending me tubes with the wrong valve type and sending the wrong quantities.