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Aurora are the best out of the cheaper Chinese bars. If you want a brand then Great whites are really good. I have seen these in action and are good. But having said that, I have a cheap chinese 40inch bar, had it for around 2 years now, being the older technology of Epistar chips, not the new Cree chips, it still is mind blowingly bright. I have just in the last week, removed it from my rack, as I noticed it was full of condensation. Not bad after 2 years. So I removed the end plates and dried it out, then re sealed the end plates up and gave it a lick of paint. As it was black but had turned a gold colour. Looks brand new again.
If I were to buy another light bar, I would not hesitate to buy a cheaper brand again with Cree chips, you do get what you pay for, as the more expensive bars are brighter and more efficient. But I simply cannot justify having say a $800 light on my car when there is a chance you could smash it with a tree branch or it gets knocked off.
Thats my 2c about them. Others I am sure will agree and disagree. If you don't care about spending a lot, get the best. Simple.
As for mounting the bar. I have not seen gutter mounts to suit the light bars. Not to say their isn't. I just haven't looked to see if there is. Most either use a single roof rack bar, like a Rhino rack and mount it to that or like myself, I have it sitting on the underside of the front section of a full length roof rack. Have it mounted as close to the roof as possible because if you don't it will light up your entire bonnet and blind you in the process. I found out the hard way and having a white car it mad things worse. Also if your UHF antenna is white, paint it black....