Although this may seem obvious, it should be addressed.
The fact that there is a large price difference doesn't make any diofference. They will sell dependant on the specifics of what the individual performer requires.
If I want a method for obtaining CERTAIN types of information, Technique might be best.
If I want a method for obtaining LOTS of different types of information, I would pay more for UI.
And the question of whether something is or isn't impromptu doesn't make a shred of difference, unless you're a 'purist'.
Hope this helps.
CL