Robosen sent me an early unit. I've had it for 10 days now and filmed and unboxing/impressions video:
View: https://youtu.be/NCix4cgfxAQ?si=xve6e1PL1woJSonJ
Overall it's pretty nice. I think both the tank and robot modes look great. The tank itself I have some issues with because every time you use the app to move him, Megatron has to speak before he starts moving. It's annoying. I gave my feedback to Robosen and they said they have some plans to address that. But it also frequently gets stuck when trying to pivot the tank. The transformation is pretty quick and clean. Maybe a little too simple for my taste. But robot mode… that's where this thing shines. The actions are fun and his movements are really fluid. Definitely the best in terms of smoothness compared to Optimus and Grimlock. Speaking of Optimus, there are actually some interactions between Optimus and Megatron. One is a hilarious scene where they pose together to take pictures and the other is an action sequence battle between them. It's really cool.
So anyways, I like it overall. I bought Optimus myself and Robosen have sent me Grimlock in the past and now Megatron. I wouldn't have purchased Grimlock due to the price but Megatron… that would have been a purchase. Let me know if anyone has any questions or anything that I can help answer.