I've been following along as well, though it appears that two drives give one AR result with a confidence of 4 while one drive gives a different AR result with a confidence of 10. The fourth drive wasn't able to get an AR match and delivered inconsistent results in two attempts.
Used drive : LITE-ON DVDRW LH-20A1P
Make use of C2 pointers : Yes
Track 17
Track quality 100.0 %
Copy CRC 6CC43F51
Accurately ripped (confidence 4) [FC233DE5]
Copy OK
Used drive : HP DVD Writer 400c
Make use of C2 pointers : No
Track 17
Track quality 99.9 %
Copy CRC 6CC43F51
Accurately ripped (confidence 4) [FC233DE5]
Copy OK
Used drive : PLEXTOR CD-R PX-230A
Read mode : Burst
Track 17
Copy CRC 9EF72F6E
Cannot be verified as accurate (confidence 4) [03739B0E], AccurateRip returned [FC233DE5]
Copy finished
Track 17
Copy CRC 896C151F
Accurately ripped (confidence 10) [FD203DE5]
Copy finished
Track 17
Test CRC 896C151F
Accurately ripped (confidence 10) [FD203DE5]
Copy OK
Used drive : TSSTcorpCD/DVDW SH-S162L
Make use of C2 pointers : Yes
Track 17
Track quality 98.0 %
Copy CRC BD682A8F
Cannot be verified as accurate (confidence 4) [FA2D182F], AccurateRip returned [FC233DE5]
Copy finished
Track 17
Track quality 99.4 %
Copy CRC D5A6E456
Cannot be verified as accurate (confidence 4) [EAF48E86], AccurateRip returned [FC233DE5]
Copy finished