Cheers drbam. I did do that though and didn't get that much significant info back, but it does seem to play fine with ACID - again, though, there's not much detail. No mention of any CPU mentioning or similar, which is good news, but it would be good to definitely hear some fresh opinions.
Also, people have certainly experienced far less UAD problems with ACID than Vegas, so if possible I'd like to hear actual experiences of people using the Powercore with Vegas. Although they look very similar, I really think ACID and Vegas' audio engines are quite different under the hood.