Is it possible to have the same abillities on every device or is it just on one headdevice that can include Key Premium, e.g. copying.
Yes it is possible to have the same functionality on all devices. Well, mostly so. For instance, only desktop clients offer the ctrl-f2 dropdown and only android has the F-Secure key keyboard which can be used to input entries.
But you can enter new passswords on any device and they will be synched to all other devices etc.