I like the flickering ones - I have a few already as CostCo have been selling them for a couple of years. I always have them inside coloured or mosaic pots or vases to hide the bits that look fake and make them look as realistic as they can.
I love candles but with a toddler there is no way I am having naked flames about the house now so the flameless candles, if decently done, will do in a pinch.
Just more pointless useless tat for people to accumulate. If you want candles, buy nice candles. If you want outdoor lights, buy those. I really don't see the point of these.