I pre-ordered my 3DR Solo on 4-19-2015, I would check there site from time, one day a click on the order number and got an Error 500 page with Solo flying on the page. I call them about several times, finally they said my pre-order expired, what? They had know explanation, just I'm sorry. We can put you on the priority list! I paid for just the Solo (7-09-2015), I was told I would have a tracking number in an email by the end of the day, nothing. I waited a day, and on the third day I call again, still nothing. I speak to a manager still no tracking number, but the money was deducted for my account. On 7-16-2015, I called 3DR to cancel my order for the Solo. They could not track down the location of my order. She it will take 3 to 5 business day to get my money back. She also promised me an update, nothing! This is just bad business, period!