Just as a point of interest; my question on the Back-up device from awhile back was answered via e-mail, by 3 people who own and use this device. All said that the device was of high quality and worked just as the manufacturer claimed.
I don't know why these people do not post on this board but assume there are many lurkers who don't for various reasons. I would hate for this device to get a bad name from those of us on the board who have never used one, it may be a good life saving device.
Anyway, thanks for all those who responded positively and negatively to the post. If I see this device in a kayak shop I will examine it much more closely.