It extends the range of environments and situations when it's convenient for you to do reading.
my listening speed is 2.3x
this dramatically increases throughput. You can start with 1.2x and go up from there. I found that moving past 1x default is the important thing. So if you've been wondering if you should try it
Having some good wireless headphones seems to make a lot of difference in making this convenient
My latest choice is Poly BackBeat FIT 3200 (among other things - they work in the shower 😛)