It's held up well now for four years. In the first following winter (2008), my buddy swore the wall was moving and was comparing it against an open stud wall he built in front of the block wall. I didn't believe that was the case because the carbon and epoxy looked like the day they cured but I couldn't convince him that his studs were moving. To prove it, I epoxied a glass slide (laboratory type that is used with a microscope) to the wall on both sides of the crack between two of the carbon spans in the most offending area. It's still intact and hasn't broken loose or cracked proving that the block wall has not moved at all. His stud wall, however, appears to bow/move as the humidity changes in his leaky basement (at least the crown in the studs are in the correct direction! ;-).