Pandora wasn't vapourware. It existed, but delivering hardware at scale is *hard* and they got screwed over massively a few times (for instance the company subcontracted to develop the joysticks took the money and ran.)
They did eventually deliver, although getting through the entire preorder list took years and they ended up funding a lot of it out of their own pocket. A friend of mine got one, but I had to drop out and get a refund eventually.
I'm not denying they eventually delivered, but it was years late based on their original shipping claims when they took pre-orders, by which time their hardware spec was below an average mobile phone...
I actually ordered one before I came to Japan... at that time the website said 'In stock for immediate shipping' - as this was after the product was finished.
A week later I checked the forums... and guess what, their supplier had shipped faulty components, and they had no shippable stock... I cancelled the order a month later after they failed to deliver.
It's totally understandable that a small run project will be late or have problems, but if you've no stock to ship, don't pretend you have it... and don't claim your project will be complete in months when you're taking pre-orders, if you have no realistic chance of doing so.