That's a great price, man. Congratulations on your purpose.
Windows 10 Mobile Insider Build 10549 is running very smoothly. There's still some stutters, graphical glitches, and bugs but overall it's almost as if not as smooth as Windows Phone 8.1 and battery life is coming along nicely. It's a huge improvement over the last build (10536).
Helps to do a hard reset though which shouldn't be an issue with a new phone.