I have an R41,but haven't used it in quite a while now...I did have problems at first, my very first shave with it ,though close left me feeling as though my face had been sandpapered...very rough sandpaper at that!!!...
Eventually I did get the hang of it and it will give you silky smooth, very close shaves when you get everything right. I found it to be blade sensitive and For me it worked very well with the smooth and not too sharp Astra SP's..
Codfish over on B&B gave me great advice for using this razor..(Thanks Codfish).....He said to start by putting the razor head on the face, with the handle sticking out at right angles..Then lower the handle until you can see the blade cutting edge(in the mirror) just beginning to touch your face...this is about the right shaving angle,give or take a degree or two...use almost zero pressure,and away you go..
It took me a couple of shaves using this technique, then one morning everything came together and....WONDERFUL...So smooth and silky I wondered if the blade was cutting at all...It was... and from then on gave me the best and smoothest shaves I've ever had....Apart from my top lip...I never did get the angle comfortable for that, my nose was in the way....
It just doesn't get used much now, It needs a lot of concentration...And Razor AD kicked in and..Well, off we went on another tangent...Great razor though, when you get everything right.......Think its overdue for another outing.