I am interested in this phone, too. In the last month I tried 3 different phones: Moto X Pure, OnePlus X, and just recently, the Nexus 5x. I found fault with each of them, eventually favoring my OnePlus One running SlimSaber every time.
I am looking for a smaller screen size/form factor plus great ROM support. I was really hoping the 5x was going to do it for me, but I found it very laggy and would often become completely frozen. there have been a lot of reports about this, but I attribute it to the 2GB of RAM.
The Robin seems to have the same specs as the 5x, with the bonus of 3GB of RAM. Time will tell if the developer support is there. If it is, I'm going to try it. At $399 retail, I bet it will be available on swappa for a little less than that, which would make it a pretty good deal in my book. I'm a little concerned about the bottom notification LED, as there is no way to cover it up when it's on your bedside table. But there are ways to disable the LED with Do Not Disturb I believe, so maybe it will be a non-issue. I like the design/aesthetics, too. I don't care that it's plastic just hope it's not too slippery.