The oatmeal are very finely ground and the powder dissolves very well in liquid. It also form lumps (as eg egg white powder sometimes happens). The taste of the powder is "tasteless", ie it tastes just like regular oatmeal also taste.
Priced: Clear you get a kilo of ordinary oatmeal for under a euro and this can then grind with a mill. However, I would like to save the time required (mainly because I eat a 5kg bag of the month) and am therefore willing to pay the extra.