Yes.....they are a BIT noisy. I've put a couple of hundred miles on mine and while the engine/tracks are pretty quiet, the vibration brings everything else "to life".
A normal conversation is impossible.....but shouting still works well.
It really gets going above around 10mph. Up to that point she's pretty quiet.
Parade speed...2nd gear low range...is very quiet and the lack of noise really surprises folks.
I tell them it's so you can sneak up on the bad guys easier!!
Keith