I use this device all the time! Most of my podcast recording is done outdoors on dog walks. This device comes with a lav mic and it's so small. I use it a lot for interviews too - I bought three. If I'm doing video interviews I use them on me and the talent and sync it up in post.
They're perfect for recording back-up audio too, just in case something goes wrong with your main recording rig in your studio.
I use this