Have you actually had an issue with buffer underruns with blurays though? I'd figure reliability should be way up, considering we now have multi-core CPUs, plus writers probably support variable speed writing that slows the write if the buffer is running out of data, plus error correction/recovery options for if it happens anyways. I'd guess vibrations, low quality discs, and loss of power would be more likely to cause a write failure than a buffer underrun these days, but maybe I have too much faith in those involved.