PWM is the best way to dim and no , NONE of the LEDs are not dimmable .
It's how you dim it , clearly if you use a triac dimmer on the led driver circuit , it will fail quickly .
There's two methods , resistance method ( those big ol' VRs ) which is frankly stupid .
And PWM , which is the best and you get off shelf for a few bucks from china .
None of the LED strips i bought from China has failed , running 24/7 for 1 year now .