I haven't read the manga, only a few frames, but I have seen most of the anime to date in japanese and I like what Funimation has done with the english dub. The only character that I wasn't very impressed with was Mokona. I would have liked a voice more like the Mokona in the english dub for Magic Knight Rayearth (another must-see from Clamp). But I suppose that voice actress is not on Funimation's contract. Anyway, it is nevertheless a great start to Clapm's newest crossover. If you read the manga XXXHolic you will find scenes that cross with Tsubasa. And I think just about every character ever conceived by Clamp is in this anime. I give the creators of Tsubasa kudos for coming up with so many different worlds and a background story to all of them. That's why this amine gets my "this is what I call good anime" review title :)
Tsubasa has almost all clamps book characters like the demensional witch from XXX Holic and the CLAMP school detectives and of course, Cardcaptor Sakura. Tsubasa is about a boy named Sayrone (not sure how to spell it)and his life long love princess Sakura.... and few other characters like Mokona, Kuragone (is that how you spell it?) and Fai, all on a trip to collect sakuras feathers of memory. They are scattered throughout demensions and are REALLY hard to find...... in the beginning they all have to "pay" the demensional witch Fai and Kuragone dont mind but Sayrone will have to pay dearly watch tsubasa and find if they collect the feathers and what price Sayrone has to pay.