The pioneer 2208 seems to slow down the rip speed on some blurays. Using opti drive control to log the rip speed of a "problematic disk", with anydvd enabled as well as disabled, I found that the 2208 slows down rip speed even with anydvd disabled. The problem is not with anydvd. It is with the pioneer.
To give some background, I've been using Liteon iHBS112 blu ray drives for ripping blurays. I happen to have 4 of these drives, so I can rip in parallel. While I've generally been happy with the drives, they occasionally "lock up" and fail to open the tray. I got tired of this, and decided to replace them with 4 pioneer 2208's. Very soon, I noticed some odd ripping behavior from the pioneers. So I decided to run some tests.
I tested ripping speed using one particular "problematic" bluray. The bluray disk was "The Silence of the Lambs: Special Edition", a 40GB DL disk. Using optidrive control, with anydvd enabled, I got a straight 2x rip through the entire rip. A textbook case of riplock. I then disabled anydvd. The speed improved, but not to what it should have been. The rip started at 2x, peaked at 5x, and averaged 3.4x.
I ran my tests on the problematic bluray with 4 different 2208 drives and found the same result, so I don't think its a specific issue with any particular 2208 sample.
I ran the same tests on my iHBS112 drives and found they had no problem ripping at my expected speeds.
I decided to buy 4 LG WH14NS40 drives and ran the same test on them. I found LG's had no problem ripping the problematic disk at the expected speed.
I also found that the pioneer failed to rip another bluray, which seemed to have a problematic sector at around 17GB. I tried ripping the same bluray using Liteon and LG drives They both succeeded. The Liteon passed, with some slowdown at the 17GB point. The LG with v1.0 firmware passed, with significant slowdown at that point. The LG with v 1.01 firmware passed with essentially no slowdown.
My conclusion was that the 2208 is not a good choice for ripping blurays. I've returned the pioneers and am sticking with the LG's.