For another multicopter in the $500 price range, check out http://www.thepocketdrone.com - the most successful drone Kickstarter of all time (raised almost one million dollars). Disclosure: I work for them.
Shipping is due to begin late summer, but Kickstarter orders will be shipped first. I've been told there is going to be a price increase sometime this month, although I'm not privy to the exact date.
Your website is a bit withholding for my taste.. clicked around looking for a decent flight time approximation (vs. weight, conditions etc.).. Found nothing.
Are the blades proprietary? If so how much will they be?
I have quite a bit of quad/hexa-copter flying and the #1 problem I have had is replacing blades. Luckily my more expensive copter I have uses the same blades as RC planes so they can be ordered cheaply, but thats not the case with my other drone. I can foresee a huge headache for your users if the pocket drone uses proprietary blades.
* What flight time does it have?
* If you pre-order today (not that I'm going to), when can you expect to receive it?