Aside from being expensive, these Collins/Ultralingua products are reasonable purchases. They seem to be essentially the old Franklin electronic dictionaries ported to the Iphone. One could certainly have hoped for a more comprehensive dictionary after all these years, but no doubt some improvements have been made (even if they are not very clear to me). Anyway, the obvious missing functionality from my point of view is the ability to build up word lists for revision/vocabulary building (the Larousse boasts of such an improvement). It is a little hard to know why Ultralingua have not done this too. Overall they seem a somewhat lazy company, just milking an old franchise. Hopefully competition will rouse them sooner rather than later.
JimJam0 about Collins-Robert Concise