I would definitely defer to Shawns knowledge on how well the 401s hold up. I only used it a couple times for a couple minutes while hooked to the wall adapter. However the PT is a Passthrough which Shawn carries here : M401/2/3 USB Passthrough
I got a 901 PT today and hooked it up to the wall outlet with one of the 5v 2000mA USB adapters and wow.... I get the same great taste I enjoy from the 901 at 3.7v but with a warmer fuller vapor that brings that flavor out even more and kicks it up a notch.
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