As optical media goes, there is good media, ok, and bad. This sits firmly in the OK arena. I haven't had a disk failure, or where data hasn't been read back from the disc. However having scanned these disks after a burn I wouldn't put my faith they will last for a long time. They have VERY high LDC (BD equivalent of CD's C1 and DVD PIE) at about 100 for the first 20GB, then exceeding 2000 on the outer 5GB. The BIS (C2 or PIF) follows a similar trend. Before you ask, all burnt on ASUS leading Blu-Ray burners.
So, like I say although these figures are poor, the discs do work. If you're creating home movies or discs to transfer files then they're fine as they are readable. Creating for a back-up? Spend the money and get better discs.
Side note - This trend has followed throughout all of TDK's brands, including DVD's and CD's.