I have a 1633s that I bought from Newegg.com and it is far better than the 411s IMHO. I have no issues with my 1633s and I burn with the RicohJPNR01 discs I get AWESOME results. You can get both from Newegg.com
Thanks to all the great work by the Code guys, I use the BS41 firmware (ominpatched of coures) and get great burns everytime!!
Don't give up on Lite On just yet.
BTW every optical drive I own is a Litey!