I'm new to ProSeries, having used it the past two filing seasons.  Each season, I also used Link.  I like the portal.  It's fairly easy and straight-forward.  My clients find it easy to use as well.  

A couple functionality issues I wish they would add:

- The ability to create folders within the document section so we can populate the folder we create with files.  Right now, it seems you only upload files and they all populate on the same page one after another.  It would be nice if we had the ability to create some organization and I think folders would go a long way to help. 

- I'd also like to know when a client has viewed the document I upload.  Is there a way to see that?

I'm sure there are a few things I'm missing but overall, I like Link.  It's definitely a time saver and since it's part of the ProSeries package, there is no added cost.