M2K High Output Alternators, Anyone use them?

Has anyone run these or heard about this product? They look like really good quality alternators, aluminum housings with 6061-T6 pulley and amp output ranging from 250A to 390A! However can't seem to find much on the interwebs out them.

Check them out here:
http://www.m2kinc.com/category-toyota-2-38.html

 

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Depends on why you need it. Can you get by with a two battery system, or do you need the additional capacity while rolling for something like extra lighting, etc. A bigger alternator will take more hp to turn, reducing gas mileage and available power to the wheels. Nothing is free.

 

More amp output for accessories, I have the 2-TR and the alternator is pretty much just big enough to power all the stock equipment. These just looked like really high quality, was more curious as to anyone has used this brand or not.