As an on-demand, modest-dose, convection enjoyer, I found this thread and ordered from XVape about midday Wednesday ("jingle" coupon worked!), USPS received it by 5:30pm and it arrived Friday mid afternoon to the opposite side of the US. Prompt shipping from XVape, and good work by USPS. Happy Weekend To Me.
Burning off the heater gave disappointingly nasty smells that thankfully became less intense. The first load tasted mildly tainted but I'm optimistic it'll become neutral. I've had a Grasshopper and Firewood 5 that show it's possible to have no odor from day 1 so I'm slightly disappointed (but not surprised from what I read here).
Generally I'm very impressed, apart from slightly obtuse controls and a flashy but uninspired and minimally useful display. I've missed having something that uniformly toasts its load since my Grasshopper died, and this seems a lot better than the GH in almost every other way. The Firewood is almost great, but the large ceramics he persists with are a huge heat sink and mean only the center gets toasted. This shrinks the FW's effective
load size significantly from its total, and it needs frequent stirring. As a result the Roffu packs much more of a punch on similar loads, and surprisingly seems even cooler/smoother.
I like a multi-chamber / cartridge type setup and the dosing caps work great. Getting the lids off is a PITA finger-nail destroyer, but the gripper end of the stirring tool built into the Roffu is a good tool for the job. I removed the pre and post screens as I'm using caps only.
So marks off for the off-gassing smelly heater (and possibly too much silicon), overly fiddly interface, non-optional, simplistic but flashy bright display, but a great device assuming the vapor becomes neutral. It seems to do a great job of quality controlled vaporizing and it has a premium feel. Powerful heating, quality even toasting, effective cooling and smooth vapor for my direct use. Great value.
Couple of technical observations:
Out of curiosity I weighed the glass and metal chambers (no screens) and found out they will take almost identical energy to heat up - 1.50 Joules/K for the steel, 1.43J/K for the glass. However, as steel conducts over 60x faster than glass, that's the key difference there and I'm not sure this information clarifies anything any better than experimentation:
I plugged it into a Lenovo laptop charger that can do 20V and it happily stuck to 5V and 960mA, so under 1A, so I don't know what the concern is that led to the instruction to limit which chargers to use.