I am looking for a camera unit that can replace the Canon 580 EX with almost the same power.?

In the digital camera market there is a flash unit for Canon EOS made by another company. It is suppose to be equal to the Canon Speedlite 580 EX but cost much less. I read an article comparing the Canon 580EX with this flash. I cannot remember the maker.

Promaster 7500DX is an option..
http://www.promaster.com/products/produc...

Another option might be a Metz 58
http://www.metz.de/en/photo_electronics/...