There's a huge variety of experiences to be had while woofing, so make sure you prepare for the worst (tent sleeping, very little shower access, controlling hosts). Definitely talk to alums of whichever site you have in mind if possible!
Turns out, most people value you less if you give away your time and energy for almost free, instead of value you more.
For short times it might be fine, as the initial welcome may still balance some of that. But any longer term and you’ll likely feel an imbalance.