from comparing Ian's reviews, it appears that the SM-348B is the better drive.
the only advantages the 352B has are slightly faster reading/writng speeds and DVD-RAM compatibility.
the 348B seems to have better performance in some benchmarks, better media compatibility, better DVD+/-R/RW support, better with scratched CDs.
Ian, do you still have the 352B drive? if so it would be interesting to see if firmware upgrades improve the 352B.
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
M.C. Escher - Reptilien