I'd be interested in that comparison, too.
I have a v7/v8 with BIOS gap and originally an open-faced laser that won't read CDs very well and won't read DVDs at all after a DMS4 installation attempt.
I've tried both types of lense replacements with no success. For some reason if I change the whole drive assembly with a closed-face laser from one of my other PS2s it works about 95% of the time. I thought you had to run this lense changer program first but apparently not in this case?
Weird. Maybe this will help, otherwise I think I have a bad drive assembly (or electronics in it anyway). Hopefully I can expliot in since it's not modded.
Apologies, as this is probably out of place for this thread.
v08 - DMS4 Lite EZI - 40GB drive.
v12 - New laser, master power switch, will install custom HDD
v12 - Dead, no power, blown fuses (experimental, parts)