Review on 2-Pack HYB Slim Digital HID Ballast 55W 12V - Universal Fit For H11, H7, H8, H9, H4 & More! by Joshua Turner

Worked fine for a solid couple months, no issues, had one fail to where the light works intermittently. Swapped the ballasts and the problem stayed with the bad ballast so I know it’s not the bulbs. Have to turn my lights on and off repeatedly to get the headlight on now so I can drive at night. They worked great until one broke but now I need new ballasts.EDIT: Bought another set, relocated to be further from headers and I've had less issues. These don't perform well in colder weather either and have flickering issues when kicking on. Still have the intermittent issue with one side not coming on, but turning them on and off repeatedly eventually fixes it. I've replaced the H1 bulbs so I know that's not the issue. Canbus worked fine on my first set but I've got a code on my BMW OBC now with the second set, not a big deal. Difficult to find any other aftermarket ballasts for HIDs that are any better, so I guess this is the price I'll pay for running HIDs.