11-46 cassette with 48 chainring for commute bike
The advantages of 1x11


11 fairly evenly spaced gears
Can use narrow-wide chain for decreasing chain jump.
"lighter" by some small amount
mechanically simpler


The disadvantages


Gaps between gears are larger than on a 2x10 or 11 
you need a really big back cog for low gears rather than having a smaller secondary front chainring.  This adds weight and its at the back.
You need a fancy rear derailleur capable of handing all this spare chain.
This all increases cost.


I believe theres a 10-50 cassette in the sram line now - marketted as "Eagle"