I wouldnt say they are all the same, but perhaps similar in concept.
If you have any questions we have been moving quite a lot of the 20Watt H8 Angel Eyes from HPB. We stand behind the product and offer great customer service, and its priced better then the competition, win/win.
They are on sale to E90 members here: http://www.e90post.com/forums/showthread.php?t=721070
You will also find reviews and pictures their too.