ORIGINAL: hadatom
I got two XB-70's. It is my favorite edf. It is correct that the nose connecting rod is too soft and needs to be changed. I greatly improved the power on the plane by cutting out the bottom rearward of the fan and putting a straight tube 70 mm diameter all the way to the back. Otherwise it was underpowered. I believe it is still available at H1 hobby
http://www.h1hobby.com/ Very good service, this is where I got my second one. I think they only have it in grey.
Their site only lists 5 EDF jets, none of which are the XB-70. I found another site that lists the plane in stock, might have to order a spare before I fly mine.