Some random thoughts...
I would not recommend using it without the flavor chamber installed. That is going to gum up the inside walls with oil that will make it a bitch to install and remove the flavor chamber later.
I ran my first ten bowls with some degummed hemp fiber in the flavor chamber and thought the unit was weak. Turns out I had too much fiber in there. When I pulled it out it was nice and gummy and vaped really well, and the IQ started performing like a champ. So I recommend getting to know your IQ empty first before going for infusion.
I'm having good sessions with a full load tamped or not. I'm also leaving my pearl fully extended and taking up 30%ish of the oven space. I'm getting good results with a load tightly packed that is half full or more after packing. Less than 1/4 full after tightly packing will vaporize but the clouds get thinner. Las night I threw a whole nugget in there and loved it, but I haven't done a post inspection of the abv yet (I know, bad stickstones).
As my pictures showed, the oven doesn't stain if emptied and brushed immediately after use. One bowl of reclaim in hemp fiber stained it immediately, though. I like hitting it native, but last night I tried the nibbler and liked it. Vapor was thicker without the bubbler, obviously, and the unit does such a great job of cooling without it that I won't use that much...but it is a perfect fit!
I'll start weighing loads now and testing different packs for light loads and report back. Now that I know what it works best with I can start quantifying that.
I did do a temp test of the bowl and was impressed. I placed my temp probe in the middle of a ball of hemp fiber to simulate a full bowl. The temps lagged behind the display by 100F at first and then by about 60F at the top end. But remember I am measuring the center of the load while the IQ is sensing the outer walls. After about 30 extra seconds at 446 to soak it stabilized to 445/446, which is incredibly accurate!
The unit gets pretty warm after a long session on high temps. My wife is not a vaporist and thought the unit was hot when she touched it. I've done this test with her in the past with other vapes and she is on the sensitive side for that test. No part of the exterior gets hot enough to injure, even on the sensitive lips. So for most it will feel like a nice hand warmer, like the log vapes, and for a very few it will will feel hot. I expect no more than a few of complaints about the outer temperature...it gets warmer than the Pax, but will feel normal to most vaporist.
The IQ makes an audible clicking sound that reminds me of a geiger counter. It's very faint and only noticeable when it is within about 18 inches of your ear. It does it anytime it is heating, so it's pretty constant. It doesn't bother me, but it's unique and noticeable.
The app is easily the best I've ver seen. I hate apps that are required, and this one is not. In fact, after initial testing I don't use it at all anymore. I'll use it occasionally to mess with the smart paths, but after that I can do everything I want without it...yay! The interface is cool and effective.
I've been using it almost exclusively since the weekend and am very happy with it. With a rotation of two or three batteries it feels like a workhorse.