I purchased about 3 different versions of these candles to test which ones my wife liked best. Every so often, "Romantic Night" or "bubble bath" is a request I receive. So like most dutiful husbands, I find the candles and lighter. After the soot build up on the walls near the bath, and the sleeping with lit candles incident, I wanted to get a safer and more forgiving option.
Pro's: Turn it on, and get the look without the potential dangers of an open flame. Relatively similar looking to real candles. Just enough light to set the mood with 2 or 3 sets. You can fall asleep and not be concerned that you will cause a fire or damage the nearby objects. For example, these can be place on top of bare wood, electronics, and other places you would never put a real candle.
Con's. Light output/lumens is terrible. If you like the way a real flame can illuminate a nearby wall or plant, this barely casts local light. The flame flicker is just not there. A nightlight with a plastic/wax case. Short battery (which may be our fault) but if this was truly efficient using an LED, you could do this for a year or more. Perhaps this would double the cost, but if it doubled or tripled the light out put and made it last really long, I would pay it.
Get enough of them, and make a display. This makes the wife feel all the key words. "Romantic" "Cozy" "Relaxed" etc.