When I was on the carb counting course, the other members of the group were very definite they were not interested in pumps. The main reasons they gave were needle phobia – the idea of having a needle permanently inserted was enough to make at least one of them feel ill (a valid reason I guess, but he was giving 5 or 6 injections a day anyway – surely one ‘injection’ then a tube for a couple of days is better, but who can fathom phobias!) and the thought of having to carry something of that size permanently attached and (to them) a very visible indicator of ‘non-normality’.