The iHAS424-98 is a rebadged Optiarc AD-7241S. It should perform similarly to the Optiarc it is based on.
The iHAS424-08 used a MediaTek chipset, whereas the iHAS424-98 uses an NEC chipset. One key difference is that while NEC chipset drives are excellent for doing quality testing of burned CDs, they are generally not as flexible or feature rich as MediaTek drives for testing burned DVDs.
Check the NEC forum for information on the AD-7240S and AD-7241S (the only difference between the 7240 and 7241 is that the 7241 has lightscribe).