No button issue with mine. Feels exactly like my other Mini and 2.5 Standard.
This whole rig with 18650 battery is lighter then my Lab-50, 18490 battery, and no topper. Almost to the point of not feeling as durable as my other ProVaris. I'm sure that's all in my head though, Provape is nearly unmatched in quality.
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...rotten people. ;-)