I think the main reason I probably won't be getting an OnHub (for myself at least -- it might be perfect for my parents) is my love of tinkering and learning networking. I like that firmware like DD-WRT lets me poke around at the internals, and actually calls features by their standardized names instead of some made-up copyrighted marketing name.
The interface is definitely not going to win any Awwwards. The feature set, though, is one you'd usually have to pay a considerable amount more to get directly from a router manufacturer.
I'm not talking about Google, just different manufacturers in general. I think the specific router I had helped configure before was a TP-LINK small business router, which may have contributed to the feature naming. I wanted to set up a server in a DMZ, but that feature was called something unexpected like "Virtual Server."
If it works as well as advertised, with as little fuss - this is absolutely the go-to Christmas gift for techies to get their parents/grandparents/uncles/etc. It's worth the price tag for me to get my family on a device that I don't have to fiddle with every time I visit.