The inhaler was really developed for the diabetic that just can't cope with needles. It is NOT a better method of delivery than by needle, but as you say, just a less invasive method. My method of coping with the needles as Im as big a baby about giving myself shots as anyone, is I use very very small needles (BD 33g 3/16's of an inch).
The new inhaler has been developed to use blister packs of insulin in powder form, equivalent to 9 unit or 3 unit doses.
As I metioned earlier, a major problem with the inhaled approach at this point is its inability to deliver more precise insulin doses. Three units of Regular insulin would make it difficult for many to achieve excellent control which is the real goal of insulin delivery. Using the 1800 Rule for Regular insulin, someone on 50 units of insulin per day would drop 90 points (5 mmol) in their blood sugar per 3 unit pack, while someone on 30 units a day would drop 180 points (10 mmol) per pack. Precise control flies out the window with this sledge hammer approach, especially compared to insulin pumps capable of delivering tenths of a unit with precision.
In my opinion its a bit of a Rube Goldberg device but if it gets people that are needle shy to start taking insulin, so much the better. For the majority of us, its simply not the answer.