I've heard a few good things about the milwaukee stuff but no technical details, it certainly got a cool factor to it being welded here in NA and relatively rare...I'd check out their direct prices before paying $350 on Ebay, seems like you should get a fork with that for $350US
I also wouldn't buy it unless I knew more about the cats making it, but there is no info to be had except that they are exclusive to Ben's Cycles. Being secretive is no way to get a rep for good welding/frames