I was desperate for one and since Newegg hasn't had it for awhile, I ordered a full retail Chameleon version (p/n 91.4ED37.474) from Computer Brain here for $31.47 + $8.95 shipping, no tax. Ordered it Thursday evening, received it the following Monday afternoon. You can see all Aopen DVD-ROM drives at Computer Brain here.
The Aopen 1648/AAP PRO came with firmware version 1.01 and compared to my Toshiba SD-M1712 with the anti-rip lock firmware J004, the Aopen drive is quite a bit faster when ripping DVDs. I'm still evaluating cd-r and cd-rw read performance with Nero CD-DVD Speed 3.80. Also I'll have to try firmware version 1.02. crosses fingers
SmartRipper 1.41, The Matrix DVD
Aopen 1648/AAP PRO = 7:29
Toshiba SD-M1712 = 10:56
About a 3.5 minute difference!