I would not call Audition and Premiere “fully integrated” by any means. I’m hoping that in verison 2.0 Adobe will let you do a true multitrack audio edit of your Premiere projects in Audition just by opening up the project or timeline file. That would be full integration…
I used Soundforge for quite a long time, I think version 4 was the first I installed. Nothing too drastic has changed. I’ve used version 8 and it’s basically the same as 7 with a few new features that are kinda cool and the interface was cleaned up a bit.
I’ve really started using Audition a lot more. I’m working on my first full Audition project right now, mostly because I recently learned about the DirectX support and how you can use all of the effects and tools that Soundforge has within Audition – like Wave Hammer. To my knowledge, Audition does not have it’s own version of Wave Hammer and to tell you the truth, that was the only reason I was even using Soundforge any more (at least for finishing or prior to importing into multitrack). Now I just have Soundforge installed and use Audition with all the effects that Soundforge used to give me.
Audition’s single track editor takes some getting used to, but overall I think it’s an awesome program with a lot of power.