The new streams have excellent support for high/low watermarks and 
auto-pausing/resuming, but the documentation confuses me a little... 
particularly the read method.

When I read the new docs for the first time I was under the impression that 
the optimal way to become a user of a stream is to write loops around the 
read functio.  However in practice I find myself simply writing custom 
writeStreams and use the callback to control upstream pressure (in addition 
to source Watermarks if needed).   Here is an example where I move the 
output to a queue that executes a custom function in parallel (i.e. 
uploading to a database)    https://gist.github.com/ZJONSSON/5189249

Are there any benefits to using the read method directly on a stream vs. 
piping to a custom Writable stream?  

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