What kind of return on investments are people getting on Google's click to play video ads?

Are they worth trying out to advertise a product I am selling for a client?

In sort, do they work as well as the text ads?

ROI as far as adsense is concerned is very low and you don't tend to get the right CPM for the ad space it takes and so I am not sure the other part will perform but I can say adsense does not