Reading your Shorthand notes/journals

I've heard that Gregg Shorthand is mainly based on outlines of words and that it is mainly intended for writing things that will be re-written out later.  My question is this:  Are you able to read things you've written a very long time in the past?  Would Gregg be helpful for things that you do not intend to re-write out longhand later? 

(by cerinye for everyone)