I'm a field recordist and I have several recorders. The sony pcm d100 is amongst my favorites. I take it with me when I need a small kit, or for on the fly recordings.
Since I do record mostly outside, I need a windjammer. The rycote windjammer for the D100 sounds slightly better than the sony windjammer that comes with the recorder. A bit better protection and a little less HF loss.
It performs well in soft or light moderate windspeeds. If the wind picks up more, I need to either put a Low pass on the recordings, or move the recorder to somwhere where it is more in the wind shadow. Only in more heavy wind, I need to resort to bigger windjammers.
This is an excellent accompanyment for my Sony D100. I can now just take it with me anywere I go, and with this windjammer I can record in all moderate weather conditions. Very happy with this windjammer.