I must say that although the hours are less I dont know anyone who has completed the NPPL in the minimum 32 hours!! Granted that the instrument training and the Xcountry requirement is less, I did a Xcountry well in excess of the required even for the PPl and did a lot more instrument training so I dont think that can be an issue!
Now the point is that if you chose an NPPL then you know the restrictions and you must live with them! I for one cant see the point in going for a PPL as I can do all I want with the NPPL!