One of my concerns was security: how they were going to prevent this becoming yet another vulnerable 'Internet of Things' device that some reprobate might hack and send bad messages to kids. But the implementation of the 'Trusted Circle' seems well-designed and easy to manage, so I feel comfortable now.
Best of all: the automatic firmware updates. While I'm looking forward to seeing what additional Apps Toymail might introduce, the fact they can patch any bugs or security flaws that might emerge in the future is SO important, and a feature not present in a lot of other 'Smart' devices, let alone children's toys.
If I had one criticism it's that the instructions in the app and on the site are a little thin when it comes to additional features (like Apps), but customer service have been really helpful and responsive for me, so hopefully the FAQs will start filling out as more people get the toys. And setup/using the toy are all really self-explanatory so there's no steep learning curve for you or your child.
But that's all tech stuff... They're fun toys, too! Cute, soft, cuddly, bright and funny. Durable, too: the 'voice box' hardware inside feels like it could withstand a good bit of abuse. I'm sure they'll be part of the family for years to come!