Good points first.
Price
Ability to find your tent in pitch darkness
Can be used as an impromptu torch
Not so good points.
I doubt they're strong enough to really whack in to hard ground
I doubt their ability to hold a vital guy line in in gale force winds
They aren't waterproof
The lamp units don't click in to the head, carry some small elastic bands
I will be using them for my entrance pegs as these are not vital to the stability of the tent, and keeping the other two in my kit bag in case someone takes a shine to them. I certainly don't regret buying them, and if it helps someone -not- walk into my tent at daft O'Clock, I'll be happy. I like them, and I love the idea.