The one we had with DD kinda sucked. The sponge would dry out and it felt like it took forever to warm bottles. This time around Im using a mini crock pot that I'll keep in my bedroom. Another mom suggested it in a thread in my BM.
If you already have one of those mini crock pots that come with the large crock pots and are otherwise useless, just fill it with water and keep it plugged in. Keep the lid on or refill the evaporated water throughout the day. This saved our sanity for real and was one of the best bump tips ever. No waiting for hot water and free!
Re: Bottle warmer