Stuart, since you are a rotary shaver fan, you may want to try the version that dispenses Nivea moistuizer as you shave. In the Norelco line it is called the Advantage. I’m note sure what Philips calls it. They may call it the Philishave. In climates with high humidity that may work better.
That’s the one negative with electrics. The skin must be completely dry or you won’t get a good shave at all. An exception would be a wet/dry electric like the Panasonic Linear or the Advantage. In a high humidity setting with no air conditioning, a blade will work much, much better. I always have the a/c on in warm weather so it is not usually a problem.
On bony or irregular areas, I find that a blade works best, it will bend and follow the contours of the
skin. The Braun does a respectable job on knees but the blade is better. The Braun is close enough to a good blade though that the convenience makes it preferable. Having to mess around with shaving lotions and gels is a minus of using a blade. I find the time element to be about the same between a blade and the Braun. If you only make one pass over an area the Braun would be quicker but you may miss some hairs. With a rotary, I would think several passes would be required to clear an area.
One thing the Braun and Norelco/ Philips have in commen is that the foils and rotary heads are much more durable than on other brands. That lowers the long term cost considerably.
RJC2001