A friend of mine, Rene Vanderharten, former chief pilot of KLM Noordzee, flew the Bo-103 way back when (early 1960's) and he told me the one-bladed design shook "pretty well" As Rene is relatively under stated, I would guess this means that it was pretty rough!
Here are some great photos of it:
http://www.hubschraubermuseum.de/Hub...ow_bo_103.html