I absolutely loved the acryllic model 5V. After two weeks it just quit. I returned it under warranty and received a replacement in less than a week. I loved the replacement. It lasted a week and then cartos would not get volts. Attys worked but slowly lost power as the day wore on. I contacted madvapes to see if there were trends with this PV or was I unlucky? They said these PVs are normally relaible. They had no more on hand and instructed me to return it for the mod guys to attempt repairs or I could get credit. I opted for repair and sent it back. I hope this time is successful. I'll let you know.