1) I agree passwords suck and they need to be replaced. I'm not sure that I want to tie my identity using biometrics to every service that I use.

2) My thinkpad has a fingerprint sensor in the palmrest. That's a sub-optimal location for your sensors?

3) expand from identity into pseudo-health. Sell it as a toy and avoid (possibly illegally) the regulation, or get the certs and sell a quality device for medical uses. Telecare is big.

4) I would use it if it worked across my Windows machine, my iPhone, my linux machine.

5) I have zero money. It's probably worth the same as a Yubikey. (Yubikey is almost perfect, but not quite.)

EDIT: I've just started taking Ramipril for blood pressure. Would that change my ECG enough for the machine to not recognise me?