When I worked in a daycare, we used one in the toddler room. I really didn't care for it. It still stunk. For me, it's easier to just have a grocery bag hanging on the door knob, and throwing it out each night. If it's a terribly smelly diaper, that one just goes right outside. Or double bag that one. Some people love it. To each his own.
2. Changing Table
I don't have one. My mother-in-law told me I could just put a changing pad on the top of the dresser. Ha! Brilliant! With my second baby, I just usually change him on my bed or the floor. Sometimes I use the couch. It's just easier to change him where you are.
3. Changing Pad
I used one more for my first baby than my second. I put it on top of his dresser. (See item 2.) It was in a convenient location. It was so much easier to just change my second baby on my bed. If straining your back is a concern, kneel. Or sit on the bed.
4. Wipe warmer
Ha. My babies have never needed one. I don't even know why people get these. Does anyone use them for very long? Maybe just put the package of wipes by a heater if you want to have warm wipes for your baby's hiney. I've never been worried about it.
5. Bottle warmer
This might be convenient at times, but You can just use a small crockpot. You could just put it in a bowl of hot water, or even hold it under hot, running water. Unless someone gave me one, I wouldn't use one.
Some people may have used some of these items with success. If you're like me, then you're trying to figure out if you really need certain products for your new baby. Maybe you go without these products but decided you really need it. In my opinion, it's better to go without, decide you need it, then buy it rather than buy it then not use it.
Check out the Baby Products I did need.
Also, 10 Things No One Warned Me About as a First Time Mom.