I think all of the Sigelei and SmokTech 15 watt mods use the same chip. I would imagine that they all have the same 5 amp limit
I must have gotten lucky with my stainless Vamo V2. It is still running strong after a year. It is not my all day device but, I use it more than anything else around the house. This will change soon though. I am moving away from the pulse width modulation devices and moving toward flat DC output.