I am lucky for not buying a 951... I remember when I was looking for a bike, I searched a bunch of bikes online and I had seen two 951 broken... so I decided to get other bike.
Intense changed the down tube by an hydroformed tube, the problem is solved. my 951 began to crack at the very same place ... they changed it. Every 951 owner, have a quick look at your down tube !!
Hmm One friend bought one at 4,000 dollars. They are in Mexico City in a mountain called The Ajusco, there are amazing Downhill trails. Those are the best in Mexico....