A major advantage of CCPNmr Analysis is the fact that it is very easy to overlay spectra. In fact, by default, Anaylsis will overlay all the spectra it can (see Organising Windows and Spectra on how to manage your windows and spectra effectively). Using the Spectra toolbar at the top of each spectrum window it is very easy to switch different spectra on and off. The fact that it is so easy to overlay spectra in both 2D and 3D is, to my mind, a major advantage of CCPNmr Analysis over Sparky.