Just wanted to post my "hybrid" setup - aftermarket mount with Phantom holder. I bought the holder from a fellow member (Thanks Jeff), and another member here recommended this mount:
AF Phantom 3 standard Mobile Device Holder (support DJI-PH3-P38)
So far, so good. The mount is very sturdy. There is a slight a gap between the bottom of the mount and the controller. It didn't seem to affect the sturdiness, but I cut a piece of a business card and stuck it in there because I didn't like the gap.
The only 2 negatives is that the new mount's lanyard hole is wider, so I need to get a larger clip. Also, my phone with its case is a little thick for the stock phantom holder. It works, but the phone can slip out if turned upside down for example. My tablet was very tight in the holder.
This setup cost me around $35 total, which is the same as the Inspire kit. I just wanted this so I didn't have to drill.
Here are some pictures: