My personal opinion is the design is not terribly well thought out. The thumb nut and tube vice look like they will be a pain to operate, particularly for disposables. The armature bare nipple to tube vice length is short limiting the types of tubes you can use and how much you want to tuck. Its clean looking otherwise and it looks inspired by other established builders. the one interesting thing is if the cam arm will bend or collapse a little under pressure. The slit and hole in the middle give this impression.