Jack of all trades, master of none.
You can use PD stems with the UD or all glass direct draw. The glass roasting tubes for both the UD and Nano are adjustable so you can pretty much make them whatever size.I've actually been using the PD with the little Pinnacle water tube the last few days and it's been cranking out some pretty nice blasts.
it's funny though, just after that post I made before, now the PD doesn't seem to be getting as hot. I've been using the Solo pretty much exclusively for a while now, but decided to bust out the PD again last week because I felt like the Solo has been ripping thru herb too fast.
Anyway, now I remember how the heat levels would fluctuate for me with my PD. Was going back and forth between the UD and Nano (the Hi still has that waiting list to get one I'm assuming ?)
...I'm sure they're both good vapes, but I just pulled the plug on a maple burl nano and a 14mm gong (I do have water tools and the 14/18 adapter, btw)
How does the bowl size of the Nano compare with the UD ? I'm sure everything is pretty much bigger than the PD though.