Yamaha are good burners, I think they were the first to come out with a 16x burner. Anyway, the lightspeed has 8mb of ram, which is extremely great when it comes to burning... but it's almost, but not burnproof, the ability that other burners based on Sanyo technology have. Burnproof allows the burner to turn on and off the laser when the buffer runs out... thereby eliminating coasters.
TDK and Sanyo announced their 16x already with burnproof. Haven't seen any place selling them yet.