Hi Helen,
Don't pay £35 for it, wait until they do one of the special offers, i think i got mine a couple of years ago for half that as a one off charge to unlock the tools.
Back to your original question, yes i can view matches that i share with a match, and it does show how much DNA that shared match shares with each of us (i.e I have a match called Fred, and we both share a match with Susan, i can see that i share 28cM with Susan and Fred shares 150cM. The important bit is you also get access to the Chromosome browser and see exactly where you match, which can be a great help if you can start positively identifying segment's as belonging to a specific family line.
Richard