I upgraded from Pinnacle 9 to Liquid 7, and now 7.1. I freaking LOVE it. I bought the Mind Meld tutorials and it has helped tremendously. I looked around at everything and just didn't see the versatility with the other products... especially with everything on one platform.
The thing that put me over the edge on my decision to go with the Liquid product was simply the price. The upgrade from Pinnacle stuff is CHEAP... and they have been running a special where it includes a lot of extra's.
By the way, 7.1 now has an EZ-Capture window that makes capturing a click of the mouse like Pinnacle does. But if you know how to use Liquid's logging tool, you can be much more organized.
Anyway, don't know if you have seen this site with the Liquid tutorials, but check it out if you haven't....
http://vfwtech.com/Liquid/Tutorials_pinnacle.htm
Oh, and here is a link to the Mind Meld tutorial stuff. There are some examples of their training video, which is well worth the money!
http://www.creationtrek.com/sample_clips.htm