Both of these albums are must-buys for me since I'm a huge Sabbath and Dio fan . I hadn't heard of the Hammersmith live album until now so that's great news as well.
I of course already own Heaven and Hell, Mob Rules and Dehumanizer, but those three new tracks on the "Dio Years" CD make the purchase worth it. Now if only there were some Dio-era live concert available on DVD I'd be in heaven (and hell).