Me again!
I havent had a chance to try my new 105 with any other media yet, but when I tried with some FWS (TDKG02) that I bought a few months ago, I get a 'power calibration error' in Nero.
I was thinking about trying the 2x4all firmware but considering this is a new drive, maybe it's best to be patient and wait for the 4x media to arrive!

Cheers