I bought M401 PT from litecigusa in 2009.
It has been great.
Has a lot of miles and wire has been yanked a few times (sorry).
Have dripped PGA inside hole several times for cleaning.
10% paint worn off.
I would prefer a brighter LED.
It's starting to misbehave but I'm still using it.
Perhaps the wire yanked one too many times or it's just wearing out.