I never had one with my 1st DD. We had a change Mat that i just moved around the house and used wherever I wanted. It slid under the couch for daytime storage .

This time round, borrowed one from a friend, but it's one of those fold-up ones, so doesn't take up much room. Only reason was because I had a CS and had residual back/pelvis problems so I literally couldn't get up and down off the floor for a couple of months and found bending over on the bed painful.

But other than a specific reason, I don't think you really need one at all!