Build a 0.5ohms coil, set the mini to 30watts and fire until it cuts out (15 secs I believe)
If the screen doesn't come up with a too hot message, the unit is supposedly good to go.
But I would still keep a close eye on it for a couple of days. The units that failed supposedly died within the first few days, and NOT because the user was firing at 30watts. I would call it spontaneous cloupor mini combustion.
Most importantly, take out the battery when you go to bed.