It works just as advertised and we had ours adjusted to fit our jars snug. I see people here complaining about paying the postage for having that done which I think is pretty hilarious. If you can't spend the extra ten bucks to have it adjusted, do each candle manually then.
Yes, I'm sure you can make your own for less (and that goes for pretty much for everything in this world) but I don't think that's a valid argument in this case. The unit is not overpriced and does it's job good. I recommend it warmly.