I just bought one of their stems, really pretty stem. But I've not heard of them... They look to be owned by Shimano. Makes Sram's Truvativ components look like trash.
http://www.pro-bikegear.com/publish/content/pro_2010/us/en/index/products/stem/mtb.html
http://www.pro-bikegear.com/publish/content/pro_2010/us/en/index/products/stem/mtb.html