I just want to add a "wow" to this discussion. The VSL version is by far the most convincing and expressive. The note transitions are just uncanny, giving it such an organic believable quality, so much like a real bassoon being played.
I'm surprised by the click comments, as I think they are very quiet and not pronounced at all. And with some slight distance added via reverb, they would be even less noticeable.
All I can say is, please do more of this piece!!! I'm just waiting for the clarinets to come in.
Anyway, thanks for posting these demos.