Door Gunner with sherman is basically double an E&E. If you are a 'have space - use space' type of person and really want to keep it minimalist, go with the DG/Sherman. Otherwise the Shape Charge is a far more versatile pack.
The only thing that's been holding me back from Kifaru day packs is the shoulder straps. Wished they were padded more and sown to the the pack itself so that they were more structured like most other packs. If they did that I'd have a Shape Charge already. And I've had an Xray since 2009