This upgrade works really well and is a huge step up from the plastic bezel that came with my M3 originally. The light is brighter, whiter and more accurate than the original bulb by a substantial margin. The only down-side is that $50 could buy a half-decent flashlight, but if you have an old M3 laying around, this is a great upgrade for it.
Pros: Bright, well-built, easy installation
Cons: Semi-high price
This review was written in the old system and had content requirements that are different than reviews written today.