I dont know how the ASUS DRW-24B1LT rebadged iHAS524 compares to an iHAS124, but I had the complete opposite experience with my iHAS124. The quality of my iHAS was lower than both my samsung and both my optiarcs. The optiarc's verbatim DL burns being WAY better both at 4x and 2.4x than the iHAS. Single layer disks weren't too differnt, but still inferior than both samsung and optiarc, with the samsung being the best (on average).
Out of all my iHAS burns the best one is the first image (an xbox 360 backup), and the second image is just a what most my Optiarc AD-7200S burns look like, some have a lower PI, others a lower PIF, and others lower jitter. I dont know if I just got a mediocre iHAS124, or if an iHAS124 is of lower quality than an ASUS DRW-24B1LT. That is just my experience with the new MTK chipset liteons.
EDIT: i dont know why the first image looks so much blurrier than the first, but i think its because i saved it as a jpg instead of png like the other one.