I entered the world of traditional shaving about 4.5 years ago. I own more than 10 razors, mainly closed comb but also open comb types (as this one is considered).
I've had the R41 for about 3 years. At first, I used it occasionally. Although I recognized that it gives a very close shave from the first pass (I should mention that I have quite tough beard, I shave every 2 days and usually do 3 passes, the last one being against the grain), the rough feeling it leaves during shaving (something like it initially tugs the hair, at least on my face), made me not use it very often.
However, after countless shaves with other famous razors, closed comb type (mainly the Merkur Progress 500 & Rockwell 6c) which I almost always used on the most aggressive setting (since they are adjustable), 9 out of 10 times, although I generally had a close and effective shave, I had small cuts and irritations, so I didn't enjoy it in the end (obviously the 3 passes I do during shaving also play a role, but unfortunately my beard grows in several directions on the lower part of my face and with 1 or 2 passes I can't achieve a truly close shave).
Giving the R41 another chance, I started using it continuously for about a month now and I was really pleasantly surprised by the combination of a flawless close shave and zero irritations or cuts.
I should say here, as other friends have written, that this particular razor performs better with aggressive/sharp blades (indicatively, I have tried it with Perma Sharp and Feather with excellent results). Besides those, I also tried it with Wilkinson Sword Saloon Pack blades and I think I found the ideal blade that is both effective and somewhat moderates the aggressiveness of the razor (and I believe this blade also forgives any mistakes or rushed movements during shaving).
Of course, the right soap for each face also plays a substantial role in the overall result. Personally, with this particular razor, I mainly use Meissner Tremonia shaving cream (I consider this company's products excellent), which does not contain tallow, but also 2-3 soaps from other companies (not fancy ones) which do contain tallow (which, at least on my face, gives the necessary glide for a smooth and close shave, something most vegetable soaps I've tried fail to provide).

Good machine. Extremely aggressive. (If you don't have the right technique, you will definitely cut yourself. But if you have developed the right technique, you will have an excellent and relatively fast shave (always with double passes). For example, compared to the Edwin Jagger DE89, and holding both razors at a 45-degree angle to the face, you have a cutting angle of 34 degrees on the Muhle and only 23 degrees on the Edwin Jagger DE89. In other words, it is a VERY AGGRESSIVE razor. Some people will like this, others will not. It is definitely suitable for those with sensitive skin because even with just one pass (without repeating in the same area of the face), you will achieve a decent shave. If you make another pass, you will achieve the perfect shave (always assuming that you KNOW WHAT YOU'RE DOING). It is heavy, compact, and beautiful, BUT IT HAS ONE HUGE FLAW: The chrome plating comes off very easily and the razor takes on a corroded appearance, losing half of its beauty and elegance. Always make sure to wipe it very well after each shave and do not let it dry inside cabinets. Despite the extremely careful use I gave it, the chrome plating wore off, disappointing me with its quality.
Advice: Always shave with the correct angle, do not apply pressure with the razor, and let the weight of the machine do all the work.

So far, I have been using plastic razors (Gillette type) and for the past two months, I started using the Muhle R89, with which I am satisfied for regular shaving. But because I prefer to shave every week, I decided to get the R41. Initially, I was very afraid of it, as I read in user reviews that it is extremely aggressive and "for experienced users", but also in stores where I asked, they advised me to think twice before buying it.

Well, I had the best shave of my life!!!! I really can't understand how it is possible to achieve a deeper shave on a week's worth of beard with the first pass, compared to the R89 on the second pass!!!! Of course, the feeling of the blade on the skin is a bit chilling, but on the other hand, this feeling constantly reminds you to be careful, not to apply pressure, and to always maintain the head at the right angle. So, with two passes (and without any "against the grain" passes), I achieved an incredibly deep shave and furthermore, without any irritation or redness!!! I still can't understand why it shaves so deeply with such little effort. The only thing it requires is attention, not to press the razor and cut yourself. If you are focused, you will be rewarded with the result. There is no need to be afraid of it in any case. I didn't have the slightest problem.

In terms of construction quality, finish, etc., it is impeccable, just like the R89. I also used it with an iKON handle further away from the standard Rosegold (beautiful) and it became even easier to use.