Oh yes, I've used those a few times and they were great. They're usually quite cheap (sub 50€), have weeks to months of battery, tactile controls (so you can us

Oh yes, I've used those a few times and they were great. They're usually quite cheap (sub 50€), have weeks to months of battery, tactile controls (so you can use them for narration without looking) and (perhaps most importantly) large and high-quality microphones. Not something you can just add to an mp3 player.