I've hit a couple of issues:
1) The disk size, at about 8 GB, is too small. Could it be bumped to 50-100 GB? Since the on-disk image will grow dynamically this won't take up that much space by default but will make it usable for those that need more storage on the root partition (and I don't want to have to custom mount additional partitions).
2) The VirtualBox Guest Additions aren't included. I'm assuming this is due to a licensing issue and not that they were simply not considered but wanted to double check.