Trust me THEY WORK. Only thing I'd have to say is that when using them I think firmer feathers work better on the feet, and more softer ones would probably be better for like the ears. I say this because I think the stiffer ones (kind of like the ones that were used as pens centuries ago) can be a bit abrasive to the inner ear, but if you just want them for tickling feet, then those are definitely the best choice. Good Luck 🙂
In some cases yes, but for the most part, feathers suck.
I would trust her opinion.......she definitely knows from experience 😉