Not personally but both DD have used them. DD1 is always successful, DD2 has had a few unfortunate incidents so mixed results.
DD1 says lots of practice outdoors preferably is you can find a safe place to try. DD2 got better once she practiced in the garden as she's only tried it in the bathroom before. Why it makes a difference I couldn't say but apparently it does.
However DD1 has always said the reason she wears leggings and a skirt or just a skirt in warm weather is that it is easier to use the SheWee and gives more privacy.
They have both been long distance walkers, not so much now and not at all these days.
I'm sure others will have more to add, good luck and enjoy your freedom when it comes.