Well I decided to take Ben up on his G2 challenge, I've come to agree with Phil 99% of the time but he did get a prototype.
I have a long video I'm posting on
youtube but here is the short of it.
1)It is NOT accurate in Kanthal Temperature Protection mode.
2)But it DOES work in Kanthal Temperature Protection mode.
Which to me is huge.
As long as you don't mind a wide temperature variability say set for 360F and get 420F and fine tuning the FSK curve to get that, it does work. I know its early in its development but the G2 does limit temperature as is. And it is software upgradeable. Mine came with version 2.4.4 already loaded.
Some things I found:
I found changing the FSK curve just one point makes a pretty large difference. I had set for 360F and found the thermal couple to stabilize around 460F but lowering the FSK curve one point and I found it stabilize at around 420F. Which hey, close enough for me.
After the temperature testing with a thermocouple I threw a Crown with .5ohm on it and it vaped great. But as I started to edit the video I noticed the display said .6x ohms. So I let it cool down, initiated kanthal temp mode again and it read .53ohm. 521 tab measured .51ohm. Only I wasn't get any vapor at all. So I raised temperature to 700 and FSK all the way to 100% and got some vapor but no where near what even 360F should give. So I tried a 1.5ohm build on an RTA and bingo it worked only this time I had to lower the temperature to 200F. I finally lowered the FSK curve from 54 to 40 and set the temperature to 360F and it was back to working at what I would call a 400-450F vape experience. I took the coil out of the Crown and it looks fine no discoloration and wet. When I first put the Crown on it didn't make contact so I used a 510 heatsink that had adjustable center posts. That might have had something to do with it. So later I did fool the Hohm Wrecker into thinking it was a .6ohm atty by loosening the atty and reinitiating kanthal temperature protection, then tightening up and it started working again. But at .53 700F and FSK 100% it still puts out very little vapor. So...there is something wrong with the Crown, pushed pin and then something wrong with the heatsink, not the Hohm Wrecker.
The included paper manual does not say it does Kanthal Temperature Protection / Control unless I missed it. It does, not real accurate, but it does.
Hohm Tech posted a video for newcomers to the G2. Awesome sound track but unfortunately tough to decipher what buttons need to be pressed to enter the insane menu to set FSK. Hold the mode (menu) and plus and minus buttons all at the same time.
I couldn't figure out how to swap the temperature and power in the display from the manual and videos, maybe I missed it but I did stumble across it messing around. Click the fire button 3 times.
I noticed a difference in FSK setting with a close almost contact coil than a spread one. With the close build I had to lower the FSK from 54 to 40 to get approximately the same vape experience.
Impressions:
In the video I compare it to several mods and it really isn't that bad. It is wide though not as wide as a SMY260. Not as heavy as a 1590B DNA200 with 2200mah Lipo. But I have to agree that other than the male female ohm engravings on the edges, it's a box. That doesn't bother me but aesthetically and ergonomically, its a box.
I would have to say that the prototype Phil got was defective. And I can understand that frustration. The G2 I got works, certainly not accurate, and needs fiddling/calibrating but that's ok. No issues with battery contacts or resets. So it isn't the best choice for someone new to vaping. But for me, someone who is a vaping hobbyist and loves tweaking, I'm glad I got it. In other words not ready for prime time with all vapers but it is for some.
You can tell when your wick starts drying out, the vapor production falls off. But you CAN discolor a build if you set the FSK too high. Keep FSK low, and it won't. Given the wide variability in actual measured temperature by changing the FSK just one point, I agree that Temperature Guessing might be the most accurate description. I don't know how it works but it is good enough for now for some. With any other VW or VV device just hold down the fire button long enough and you can burn a build quickly.
To Phils other point about the 510 spring being weak, well...it is. Not the worst I have ever had though. As is and brand new it's working fine with Kanthal builds though I haven't tried Ni200 yet I believe it will be ok so I can't say it is a problem. But I do believe a little more stiffness wouldn't hurt.
I think the biggest problem right now is the tweaking. It's tough to calibrate it without a thermocouple. And like Ben says there are many parameters involved. I look forward to continued testing. I am also tempted to macguyver an atty with a thermocouple on or in the build and wires coming out the side.
I'm not going to ask Ben for reimbursement per his challenge. The Kanthal Temperature Protection works. And that's what I bought it for. I know its new and all that comes with that but it is SW upgradeable. I'm happy.
I do recommend this over normal VW/VV mods for an experienced vaper.
Improvements:
Right now, I just want to see continued development in the SW and Kanthal temperature control.