How effective are avalanche airbags?

Considering I do a lot of solo skiing and feel a need to start switching my skiing up by doing more off piste skiing, I figure my best option is to have an avalanche airbag. How effective are these devices? Could they also help protect the individual from a massive fall over rocks?  From this video, it looks like a worthy investment. I figure with no wife and or kids, I might as well start skiing as such!lol

Here's a good way to get an introduction into one of the better studies on the subject:

www.wildsnow.com/18262/avalanche-airbag-statistics-metrics/

I have a BCA Float 42 that I use most days I go out, and I love it. However, I will say that when I consider terrain, I still ski conservatively. My understanding is that airbag packs don't protect you from hitting trees, or being swept off of cliffs. The only airbag packs that do anything to protect you from trauma are the Mammut Protection packs, and they only protect your head. It's still very possible to get smashed into a tree, etc and break bones, or other sustain other injuries.

I believe most airbags inflate to a volume of approx. 100-150L

An airbag deployment most likely saved the life of a skier in that tunnel creak avalanche.

Do you think so? She wasn't found very far from the other skiers that died from unsurvivable trauma. Do you think that she might have been extremely lucky?

Seems there was a fatality from avalanche at Crested Butte back a year or so? The person had an airbag pack on and apparently the avalanche total destroyed the bag. Probably works more times than not I'm guessing, though...

The airbags are effective when there is little to no consequences of trauma(trees, over cliffs, into rocks..). They are effective in preventing full burial and the only tool that can help with that.
www.ncbi.nlm.nih.gov/pubmed/24909367