Added to that the fact that the money you save on the medical pays for your flight with an instructor every 24 months; it can make a difference.
I wouldn't imagine that I'd have any problems with the medical, I have an annual medical at work and was A1G1Z1 in the RAF but I have an NPPL. Why?
Well, I have no wish to fly in rubbish weather, at night, to Latvia with six on board. Nice days bimbling around VFR are why I fly so why over-complicate it and pay more than is necessary when I can have a good old-fashioned 'licence for life' which I can afford to keep valid.
NPPLs are definitely not for the sick, lame and lazy; they are about informed choice.