Talking out loud a bit here... and wondering what others think.
At first glance, I liked the new display of attachments in the Thoughts tool. It is "prettier" with larger icons and text. Also, since ther are now two lines of information, I can make the window narrower and still have readable information. In v5, it was sometimes difficult to size the window and multiple columns.
However, I frequently save multiple versions of documents. It was easier in v5 to visually scan the date column, for example.
Also, the old version allowed the display of more items because each only took one line.
I'll have to see how I feel after using the beta a bit longer.