Question on iHAS model numbers

I need to replace my Liteon LH-20S1A (or something like it).

I was looking at the Liteon models on NewEgg and it seems to be mostly iHAP and iHAS. I brilliant detective skills have deduced that all the iHAS are the SATA models. And it seems like all the -08 ending numbers are retail and all the -04 or -06 are OEM drives.

iHAS120-04
iHAS120-08
iHAS220-06
iHAS220-08
iHAS422-08

Further Sherlocking has made me assume that the iHAS120 and 220 are the same, but the 220 has lightscribe and the 120 doesn’t.

There is no iHAS322 yet, but I would assume it’s the same as the 422, but without the lightscribe.

So my two questions, are my assumptions I made correct. And is there any signficant differences between the iHAS120/220 and the iHAS322/422 besides the 20X vs 22X DVD/R burning speed?

I’m looking to buy a DVD burner today and trying to decide if the $20 OEM iHAS120 will work or if I should spend extra and get the $30 retail iHAS422 (no OEM available and no 322 either)?

The 322 and 422 have smarterase.

I have terrible time with iHAS120-04. It’s burn quality is not as good as some other burners such as my old NEC ones or IDE version of Lite-ONs.

I have the EZ-DUB with the 120 in it and it scans great. What firmware version is on your drive and what disks are you having problems with?

I have flashed mine to CK’s 7L0F EOHT. I understand my SATA iHAS would not work well with TDK’s RITEK S04 and Sony’s RITEK D01 +R DL. What I didn’t realize is even Verbatim MCC030 had poor scan. IDE version probably has better luck than my iHAS.