I bought it because it is cheap. Although the brightness was inferior to genuine, it was shorter in life than that. I had one side for five months but the other side was out in a week. I think that it is a terrible high product as a result.
Although it is greatly saved by unavoidable price at the car shop, it is inferior in brightness compared with the previous high efficiency bulb. How long it will last. I think that it is very excellent if it is exchange from genuine.