Well I've setup both Foundation and Higher Active Teach for maths as well as active teach content for Science and Modern Foreign Languages without a problem.
The VLE packs have to be downloaded from the Pearson site as zip files, I then insert each zip as a SCORM pack into the course.
Each zip is then opened up and installed by Moodle itself.
The only problem I've run into with Active Teach is the sheer size of the content packages cause Moodle to have fits with the scheduled backup. Every course I've installed to date ends up unfinished, one MFL course has a 1.7Gb backup file. So the server is timing out or running out of memory. This also presents problems for the upgrade to 2.4 I have in planning (we're 1.9 atm)
But other than backups no problems have been reported by any teachers, most hadn't realised that Moodle could use their discs.