I had the same experience with Darter Pro. Also the laptop's touchpad wasn't working properly from the beginning. When I contacted them, they kept asking me to try a lot of things on my own. I tried them for a while. I am developer, I like trying to fix things on my own upto certain extent. But when I pay crazy amount for something to someone, I expect them to fix it.
Also the display stopped working after a week and they blamed me for cracking the screen, even though I kept the laptop in a bag all the time.
The support was bad too. I would get response from different person on same support request for every new message. It bothered me because it looked like the new person who replied next time had no idea about the history of the support request.