I'm sure I'm nitpicking here but this is a huge deal for me: forcing a branded splash screen onto the final product. Ugh! Why?! I understand a ton of work has been put into this engine and Unity is graciously offering it for free, but indie software is an individual's art. When an artist paints a portrait, you don't see a "Powered by Winsor & Newton Acrylic Products" stamped onto the bottom of the canvas.
I'm sure I'm coming off harsh here but seeing that limitation really turns me off from an otherwise unbelievable proposition.
Edit: spelling.