I got some new dual layer DVD's and was able to easily burn to those. The others I had attempted to use were about 10 yrs old and single layer, so maybe a standards thing? (not exactly sure they were empty either)
I ran my first blu-ray archive this morning with make MKV beta, it took about 1 hr, for a 2 hr movie, and this was in quiet mode. I'll try my next one with the quiet function turned off.
I'm now running that .mkv through Handbrake to an .mv4 and it's taking about as long as the movie is, a little less than 2 hrs. This was always the case before on my old PC. I've read somewhere that Handbrake doesn't use multi-core processors.
So far I'm happy with the Pioneer drive, runs really nice, seems to have average speed, price not too bad. Noise isn't an issue for me as I don't watch movies on my Mac.