I received mine today. Does exactly what I want. I got this for a couple reasons. I want a device that can handle an SD card and two SSDs with iPad. This gives me the ability to do multiple backups of photos using my iPad on the road. I also wanted it to work with a Dragonfly DAC and it will play from that, as well.
Secondarily, I wanted to have this in my office setup for quickly attaching my iPad to my thunderbolt display. It works for that, too. I haven't tested it with my MBP or Alienware computer, but I expect those will attach to it via thunderbolt and also to my display with thunderbolt, as well. For me, it was easily worth the $99. Still messing around with it. I will probably find a couple additional uses for those additional ports.
Only complaint is the heavy power supply, but I was aware of that when I bought it.