CB 9-11, Fritz 9-13 - worth the upgrades?

So I have both Chessbase 9 and Fritz 9 from a number of years back, but I've been eyeing upgrades to Chessbase 11 and Fritz 13.  For the most part they are both usable, with the exception of the loss of the online database access with CB 9.  Curious what everyone's opinion is on whether they are worth upgrading or not?  Not worried about engine strength, plenty of that to be had, more concerned with usability and training and analysis features.

Thanks!  Like I said, not so worried about strength, there are plenty of good choices out there for that.  So is let's check really the only worthwhile non-cosmetic change since 8?  Are that and the the interface changes worth upgrading for?

"Let's Check" was really hyped by Chessbase, but it wasn't enough for me to upgrade from Fritz 12.

So a definite maybe on the Fritz 9 - 13 upgrade.  A bit disappointing since I skipped 3 intermediate "upgrades".

Anyone more familiar with the Chessbase 9 - 11 changes that can provide some thoughts on that one?