I should be getting a Sandisk Ultra 16gb cf tomorrow so hopefully I'll get a chance to test it out over the weekend. I was running with the Ultra II 8gb last week and had no troubles with the firmware. I was using mono and stereo templates, and had recorded a 90minute dawn chorus at 24/88.2 with no hitches. As far as I can tell the deck is as solid with 1.06 as it was with 1.05 - at least with 8gb cards.
cheers
Paul