I have been using the i-inhale for about 3 months now and overall I love it.
One major gripe I have is that stupid threaded plastic stem. I've broken off 2 of them already. They get very pliable when the unit heats up and if they are bumped, snap, they break off. At $15/piece, I am a little infuriated at this design.
I've looked around at hardware stores for a metal fitting that screws into the hole but have come out empty handed. Does anyone know of a suitable replacement stem that has metal threads? If I have to spend $15 on another stem I am going to freak out. My spare stem just broke and I thought I was going to have to freaking smoke out of a pipe for 4 days until the new stem arrived. Talk about a panic attack. I used some sandpaper and sanded down one of the stem pieces and screwed it into the bowl. The stem is now really short, but thankfully I am still vaping while awaiting the replacement. Talk about frustration...
Other than that, I use it every day as my main vape, and it works great. One big suggestion: KEEP IT CLEAN! The cleaner the stem and screens, the more efficient the device. Before cleaning, I would vape 3 bowls in a night. After cleaning, 1.5 (I save partially vaped bowls for the next day) To clean, I unscrew the stem, take apart the pieces, and soak in 91% ISO. After soaked for a while, I push paper towel through it to remove all the built up gunk. I also remove the screens and soak them. After, I rinse well with water to remove any impurities in the ISO or any chemicals leeched from the plastic as a result of contact with the ISO. Probably overly cautious, but whatever. I will probably save the resin the next time I do it and do an ISO extraction on my shake and AVB at the same time.
One more suggestion, I seem to stretch my material by vaping a bowl in 2 cycles. For the first cycle, I let the unit heat up for 4 cycles and then take about 10 hits. Then I turn it off and let the unit complete cool. Usually by the time it's cooled, I'm ready for another sesh. I find the cooling period is critical in making the second sesh more productive than just continuing the first sesh until the material is total vaped. The clouds on the second sesh are way bigger than the last hit on the first sesh, if that makes any sense.