DVR-109 vs. DW-Q28A

In previous news, we were reporting that the high-end PMG5 model dual 2.7GHz was equipped with Pioneer DVR-109 SuperDrive, while the entry-level had a Sony DW-Q28A. We do not have information yet regarding the Dual 2.3GHz, but it seems to be Sony SuperDrive.
hereafter are the specs of both models:
DVR 109:
Burn DVD+/-R at 16x
Burn DVD+R9 6x
Burn DVD-R DL 6x
Burn DVD-RW 6x
Burn DVD+RW 8x
Burn CD-R at 40x
Burn CD-RW at 24x
Read CD at 40x
Read DVD at 16x
DW-Q28A:
Burn DVD+/-R at 16x
Burn DVD+R9 4x
Burn DVD-R DL 4x
Burn DVD-RW 6x
Burn DVD+RW 8x
Burn CD-R at 48x
Burn CD-RW at 24x
Read CD at 48x
Read DVD at 16x
In summary, Sony model is faster in burning and reading Cd, while Pioneer model is faster with dual layer media. The DVR-109 is also theoretically compatible with DVD-RMA, but we suspect that Apple has disable this feature as usual.