Haven't gotten the chance to play around too much with the new firmware, but so far I really like it! I thought I'd post a quick clip I made last night:
I thought the Strat sounded so good it made me dust off some SRV licks and play some blues I was running the Strat neck pickup into a HD500 straight into an audio interface. I was using the Dr. Z model with no external processing.
Overall impression of the update was that the models were way more dynamic and lively. I even noticed that on the acoustics. I know they had already gotten the HD upgrade in a previous firmware, and it could be my imagination, but even they seemed to have a much wider dynamic range than before.
I'm digging it, especially for a free update!