Medium to course. It's almost pure Convection. So you don't want to mess the airflow up with too fine a grind. Not sure about whole nug. I will have to experiment. My instinct says ground will give better results.
I agree course is likely better. FWIW though I had some already ground relatively fine when mine arrived and it still worked wonders!
My T2 just arrived yesterday! I am truly blown away!!! This is an unreal device

I got the T1 and while I liked it I could never really dial it in. Ended up going back to my dynas as my consistent and would only occasionally use the T1. The T2 pre-order email popped up and I couldn’t help myself though and I’m so glad I grabbed it.
First cycle with this thing and just WOW! So much vapor I had to question my reality, did I combust I thought? Nope, just flavor packed, surprisingly cool vapor billowing everywhere. I had found my happy place.
I used the balls that came in the device and the ispire wand with the new adapter. It almost felt too easy haha. I am excited to dive into the nuances now. Ruby balls, tweak the heat up, maybe dust off the old torch!
Judging from the pics I was worried I wouldn’t like the look of the T2 vs the sleeker T1 but when you see this in person it’s so awesome. I think I like it slightly better actually! It inspired my user name, it does really give lightsaber vibes! The slightly simpler internals are appreciated too.
I honestly don’t think I’ve felt this way about a dry herb vape since I got my very first dyna, and I definitely haven’t felt this way from a session in awhile, this thing plowed right through my tolerance (not even on the full bowl setting either)! Hope this isn’t too long a post but I’m so excited about the T2 I wanted to share! 10/10 no notes lol