Nice fitting well made grip which is expensive as it's mostly plastic and rubber, good plastic and rubber but nevertheless material costs must be pretty minimal. I guess it could be argued that keeps the weight down.
Amazon was about the cheapest I found which is one I got one from them, but also because it wasn't in stock at a lot of other suppliers my thinking was, as this camera has been out for a while I wondered if another production run would be imminent if at all. Not trying to cause panic buying here, it could just be my paranoia.
It does improve the handling, for me, of the X-E1, and has the bonus of now making the tripod socket in line with the middle of the lens, I do indoor, tripod mounted, panoramas from time to time. The obvious down side is you have to remove it to access the battery and sd card, this may encourage me use the camera supplied usb cable to download files from the camera, something I've never done.
Ater now having used this grip for a while,I am convinced it was a worthwhile purchase.If you are using larger lenses, such as the 55-200 I find it essential as otherwise the diameter of the lens protrudes beneath the base of the camera. I have come to terms with removing it every time I need to download images. I never adopted the transfer from camera via the supplied usb cable as I tend to shoot a lot of large files in a session, both RAW and fine jpeg and I understand, from the manual, it isn't recommended to use that method of transfer. I also understand it can be slow that way, although haven't tried it.