Good to see this released at last.
First impressions? It certainly has a prettier UI than that of AVCHDCoder, BD-Rebuilder, ClownBD. Although is missing a number of options contained in those pieces of software.
In any case, I just gave this a try, opting to create a BD9 (DVD DL). I was surprised at how fast it completed the task but also surprised that the resulting iso was under 6GB in size rather than utilising the near-8GB capacity of the intended end media: the end bit-rate was a fair bit lower than it could have been. As others have reported, the audio is way out of sync though.
I trust there'll be updates fairly soon...