Now THAT'S a good use example of the new DG AOU with cabsim. You can use your own cab as a sim, too.
Also ... not convinced of the usefulness of cabsims. I'm fully aware they are the latest and greatest thing out there on the FX forum and people are paying more for them than they would a cab. There was one on the VT Bass DI and it was just a treble cut switch. The VU preamp really doesn't need it and you can always cut treble a little.