Hi Daniel. I haven't ever run the Tanner tools, so I don't have any feedback for you. I also googled for Tanner reviews, say on blogs or whatnot, but didn't really find any.
What I'm hearing from other users is that the older Tanner schematics (ie v8) were single user, no project management.
I'm still wading through the tutorials though.
I'm not a big fan of using dongles with Tanner after using FlexLM for so many years with every other EDA tool.