The failures are definitely true. The modified subframe with a 107 number is true. I have even seen someone get MB's help with the problem as late as about a year ago.
We have seen this probably 15-20 times over the years and weld in the reinforcements as we see the problem occuring, or we replace the subframe and usually the control arm which gets bent in the failure. BTW I have never seen one of these fail at anything more than parking lot speed. The loading is ever so much more during low speed turns.