You don't need to press your palm, you just hover it over the plate for a moment. I think the hardware is just an IR illuminator+camera.

It does seem like a technology that should have a useful niche. Unlike fingerprints you don't leave partial copies of your vein pattern on everything you touch; unlike face recognition it's an explicit act you take so it can be used for attestation-type actions (like paying). It still has all the usual disadvantages and advantages of any other biometric. Perhaps the unique niche isn't big enough to fit a new product into though.