I bought this the day it came out and have been using it occasionally for a couple weeks.

It has boosted my engagement because I enjoy browsing questions and tend to find ones I'm able to answer more readily. It's a joy to browse questions while sitting in a comfy chair but I usually switch to a computer to answer them (maybe that was just issues with finding my old account and logging in).

I still don't turn to it if I'm trying to solve a problem I'm facing.