Can I just say, in defence of the Aopen drives, that they do seem to be better at burning low grade media than LiteOn.
For example some bad Ritek media (FWS, designated WD001, supposedly 48x compatible) I get 70% OK burns at 48x, and 100% OK at 40x with the Aopen 48x. With the LiteOn burner I struggle at 24x. In addition the Aopen will read these discs back at full speed whereas the LiteOn will not read them >32x without errors (regardless of how they were burned).
I've found this same problem with a number of bad media types that the LiteOn struggles with toward the end at high speed.
Generally the Aopen burns are lower quality (in terms of C1 count), but more consistent in my experience.