I heard there are risk of thermalock when used with cold start, which is the more convenient way to vape when using natively, is this an issue ?
I used an Anvil for several years as my daily driver before the Tornado was released and never had any issues with thermal locking. With the Tornado, I've experienced what I'd categorize as 3 different types of thermal locks:
The first type is a minor lock. This usually resolves itself once the oven cools down sufficiently. At this point even a weak magnet will be able to unscrew the bowl from the oven.
The second type is a little more of an issue in that even once it cools, it still takes a firm finger grip or even an allen key to properly loosen the bowl. Even a strong magnet won't help in this instance.
Both of the above are manageable but I still find them to be a nuisance to deal with, particularly after the hassle free usage experience with the Anvil.
The third type of lock is the problematic one. This is the hard lock where the oven doesn't come loose after cooling and even using an allen key is not effective.
I've read a lot of different suggestions here ranging from sticking it in the freezer, to not screwing the oven on too tightly and I think I even read an instance of someone having to send theirs back to Vestratto after unsuccessfully attempting to remove the bowl over the course of several days.
I've had this third type of "hard lock" on several occasions now and I've found that I've been able to remove the bowl with a quick 5 second heat up in the Forge 100% of the time. My theory is that by heating for only a few seconds, the oven expands quickly, but the bowl inside doesn't have enough time to heat up at the same rate. I've tested this and even at just 10 seconds, the bowl inside heats up fast enough for it to remain locked.
I believe this can be repeated with other heaters and even a torch, but the timing may be different depending on the device. Results may even differ with other Forge users depending on where your wagon wheel is set. Since discovering this I don't worry about how tightly the bowl is screwed in to the oven. It's still annoying to deal with it when it does lock, but it's a quick fix so I generally don't think about it anymore.