In this paper we look at the consequences of the double-carelessness of the TMD evolution. Strange, but it has been not discussed in the literature at all. In particular, we have shown that due to fact that evolution happens in a 2-dimensional plane, there are infinitely many equivalent solutions. The traditional one, aka "the Sudakov exponent", is not the most convenient. For practical applications we suggest another one that is much much simpler (it is given by an algebraic function).
See also my talk in Pavia.