The hospitals seem to promote the pump they and their training staff are familiar with. As Alison suggests though your best argument is probably patient choice. If you can find a couple of others who would be interested in an Omnipod type pump then ask them to get the Omnipod rep in to talk about it and see where you go from their. I started on the Omnipod yesterday, the nurse seemed to think the whole start up was much easier than the other wired up pumps. For me it seems pretty OK so far but its early days, played squash in the evening with no ill effects ( apart from losing!).