I have yet to run the adventure, so my review is simply based off the Tortle content and a "read" of the adventure.
First off, the proceeds go to charity, that alone means you should buy it, heck I've bought it twice, once here and once on FG
Second off, it adds an awesome new Race - Tortle to the D&D universe and it is completely AL Legal. The initial complaints were "EMERGAHD everyone is going to be running around playing TMNT in my game" but so far, I've yet to see that. I've had maybe one player roll a TMNT like character and they role played it so damn well all it did was add to the game not distract.
The adventure is solid, but sadly being SO far away from Port Nyanzaru it's hard to figure out how and when to fit it into the story - and there are frankly some better introductions to ToA that I have problems using this one as the hook. But the content looks great, good maps, delightful story, well balanced combat.