Yes... It has always been useful for me. I hated opening a really messy diaper on the couch floor or anywhere else then having to clean that area like crazy when I could have just cleaned a changing table pad or the sheet on top of it.
Nope. You'll find yourself changing your baby where it's most convenient. I change my girls diapers literally everywhere in our apartment. I'm not going to walk to their nursery just to change them on the changing table lol
We were given one and used it more often than not so if you can get one for free or close to it I would say go for it but for full price my opinion is don't bother
I didnt even bother getting one this time around. Had one when i had my daughter and i think i changed her everywhere but the damn table.. Its awkward to me changing babies while theyre laying sideways, i like them straight out in front of me.