substandard size of mounting screws (M4 instead of usual M6, good they come with washers), threaded holes for mounting screws instead of stepless rails (some 2U devices might require drilling and tapping new ones as there are only four holes per side), odd orientation of front and back covers (they open to sides instead of simply upwards, thus interfering with accessing front and rear panels of the devices inside). Otherwise bag looks quice decent, zippers look solid, hope it is going to serve well.