I think the benefit that people who struggle with sensations around injections find, are that it’s one bigger discomfort every 3 days, rather than multiple times per day. Once it’s in, as long as your doses are fairly modest in size I don’t think you’d really feel them at all.
I guess it would work the same as a pump cannula in the way it creates a tiny pool of insulin to be absorbed under the skin, and that it would be better to deliver any doses bigger than 7-8u in 2 parts with a bit of a gap? (I think it was Walsh/Roberts in Pumping Insulin that suggested that)