Let me explain this.. USB-C slot on new MacBook Pro 15" is so tight.. So, put in&out usb-c plug is very challenging.. Especially if the MacBook is on desk without any elevator like Rain design stand or something like that it's very hard the pull out usb-c plug from machine.. Another two thing is also getting worst that problem.. First, USB-C plug is so plain, thin and slippery.. I can't even hold it properly for detach it from MacBook.. So, my solution is, lift MacBook from front to backwards then hold plug firmly with my finger then try again.. Second, usb-c ports on new MacBook Pro are so close.. There is no space to hold plug with your fingers if the next port is busy.. I think it's a problem.. IMHO, maybe add some texture on both sides of usb-c plug helps.. But current situation is another usb-c issue for me which is serious than dongles..