I am one of the happy owner of a OnePlus One 64GB in "Sandstone Black". In this mobile "Sandstone" is not a marketing gimmick as usual - the nature of the back is quite similar to sandpaper. Here lies the problem - the bag is very precisely, so that it is already difficult to get the phone at all into it. Even worse then when you try to remove it again - in my eyes for everyday use really inappropriate.
I use the case now for my Galaxy S5, which in turn in a little tailored for your pocket, since I use the alternative back on Wireless Charging. This bag is a little longer, but it can be the S5 refer comfortable;)
Otherwise, the shell is very well made and the materials make a very high quality, durable impression. Therefore it gets to me - although unsuitable for its intended purpose - two stars.