Having purchased & tried to use Acrobat 7 pro, I was, as an "older" user, a little unsure about repeating an altogether painful exercise.
Acrobat 7 was almost impossible to use, with constant demands that I validate the product (this; 3 years after I bought it!) and regular crashes during the conversion of anything other than Microsoft Office documents.
Having been using Acrobat X for a month now, I am relieved to be able to say that it is proving to be both reliable and easy to use.
The front page is clear (unlike Microsoft Office 2010) and the toolbars are easy to see and understand. The processes are clearly available, with Adobe not going down the route of making things complicated, just because they can.
I am very happy to continue to use Acrobat X in favour of the PDF Suite software I bought, just to get away from Acrobat 7.
Well done Adobe !