Pierre,I use the MC-EV1.I think a lot of proffessional photographers would not be very happy with it as there is a slight delay between turning the camera on,and taking the shot,you have to press the button on the MC after you have turned on the camera,which means you do lose some time,and of course in those few vital seconds the bird can then decide to move off.But if you have a reasonably steady object,you can stand away from the camera and press away to your hearts content,and there is no vibration etc to the camera,but it does take a little time for the image to be transferred from camera to card.These remotes are quite tempermental.The first one I had would suddenly refuse to function,until I had unplugged and re plugged.It finally packed up ,and was replaced by Nikon as it was still under warranty,so far so good.But I think it is a matter of personal choice..
Having said that,if mine packed up again,I would replace it,as I find it easier to use than the manual cable releases,but I think I am in the minority of users.