Hello MANKER,
it´s always welcome to have an "official" from a company in a forum. This way you get a direct feedback from your users and the users have the feeling they can have some influence on the products and have a direct spokesman they can take their problems to.
This would be my first question to you: do you have a direct connection to the product developers and/or product managers and do they listen to you?
I´m relatively new to flashlights (addicted for 6 months now
) and only own one Manker light: The U11. I must say besides the annoying firmware bug (it´s almost impossible to turn it on in moonlight mode with a short click) it´s a very good light, even brigher than the NiteCore MH20.
No problems so far, BUT OTHERS did have problems.
Are you aware of this thread?
http://www.taschenlampen-forum.de/threads/manker-u11-fehlkonstruktion.47054/
It seems that in some U11 lights the used screws are too big an create a short circuit on the driver board or electronic elements - and this seems to be a COMMON problem with these lights! I´ve heard there is a new revision of the U11 with a different bezel, but the problem seems to be persistent.
To be honest I CANNOT understand that such an easily avoidable mistake (simply use shorter or optimized screws) is still present in this light.
IMHO errors like this can really damage the reputation of a company in the long term.
Best of luck,
K.