I agree buffer is not very important nowadays. But I really concern about the crossflashing. Also, 1673s seems more worth to buy as it has larger buffer. (Unless Liteon sells 1693s cheaper than 1673s )
Just like the green LED, it doesn't affect the burn quality, it just spoils fun.
Hopefully, it is true
If Liteon really make it 1.5M, it may be the first DVDWriter in the world with the smallest buffer size.