I find that an aluminium hotplate works quite well for me, as long as your PCB will sit flat - some can have a bit of warp/twist, especially thinner FR4. Having one that follows a profile is obviously better than relying on manual control, even if not as good as a commercial unit. I've had more problems with an oven or IR reflower in terms of connectors getting scorched.
Apart from the obvious concern with backing crowd-funding especially on IGG, he also hasn't completed his last campaign for the plastic injection moulder. He does at least address this issue (somewhat), and it is also a fixed funding campaign. He promotes it for STEM use, but I forsee too many safety issues with heat and presumably it is mains powered but not safety tested (UL, etc).
I have to admit I've once walked away and forgotten about a set of boards I had cooking... but it wasn't for too long, and the manual thermostat kept things from going bad and had no problems with the result. They were also thankfully boards for in-house use, rather than a client. So I'm somewhat tempted by this, but at a minimum I really wish it had a better UI. I should probably just fabricate my own.