Yup, we have one in Hannah's room.
She was only a few months old last winter so it was on almost all day every day. It added about $15 onto our monthly bill - well worth it to keep bubs warm
She's much bigger now, so we'll probably only have it on a timer so it's on at certain times to suit naps.
I found it put out a lot of heat, but made the room quite dry, so we just had a bowl of water sitting in the corner of her room (I'd have to re-fill it every second day because it kep evaporating

.
Well worth it, I reckon. It's a lovely even heat