I have been using both Tabac and Kent branded MWF. I can summarize the experience thusly: Tabac gives it up easily (lather that is), MWF makes you work for it.
My first experience with Kent soap was unerwhelming. I used a Kent BK4 brush, and tried to bowl lather. I did get lather, but it seemed a bit dry. Adding obviously (in hindsight) too much water, and the lather disintegrated into nothingness. OK, start again... Less water this time I note. Lather appeared, though lubricating enough to get the job done, it felt thin and not very creamy.
Second day... Time for my old standy brush: EJ BBB. Approached the puck with a soaked then shaken out brush (as the tutorial instructs), swirled on the puck for 30 seconds or so, then worked it in my bowl for a good 5 minutes, and again got a usable but underwhelming lather. I found it dried out very quickly - I had to add water to my brush after each pass, and sometimes even relather during a pass. Again I found there was sufficient lubrication, but no cushion or creaminess that I expect from a good tallow soap. I must be doing something wrong.
Third day... I'm gonna get it today, I simply must. Lots of water this time, along with my trusty EJ BBB. Face lathering instead of my bowl. Well, I might as well have shaved with just hot water (which does actually work by the way). Drops of thin (almost soupy) soap and water went flying all over the bathroom as I furiously and ineffectually scrubbed away with the brush. I'm so glad I didn't spend silly amounts of money on this stuff... Maybe it's just not for me.
Fourth day... I feel as though I'm flogging a dead horse, but I'm too stubborn to let it go now. I break out my Omega boar bristle brush. Throw some hot water on the pick and let it soak for a few minutes. Hit that puck with the boar bristle good and hard, adding water drop by drop as I went. Lathering directly on the puck for at least a minute, I think I somehow broke through the pucks outer defense layer! More lather appeared than ever had before, and even better yet it was thick and creamy just like Tabac.
I think I found the secret; I just needed MORE SOAP! While Kent/MWF will give you some sypmathy lather early on, to get the good stuff you have to work the puck thoroughly. Once I was actually able release a respectable amount of the tallowy goodness into my brush, it was a top performer. Incredibly slick, lots of creaminess and cushion, stayed wet between passes, and not an overpowering scent. After using the Palmolive shave sticks, I should have known better, as they too can be slow to release soap when they are new... If you fail to release enough product, you are doomed to thin lather. Do it properly, and you are immediately and bountifully rewarded!
As I tend to use ASB and/or moisturizers after shaving anyway, I haven't yet noticed the fabled MWF moisturizing subtleties. Admittedly I've only got one good day under my belt, so I'll keep on for another week and perhaps my opinion will change.
While Kent/MWF can create a lather on par with Tabac, in my mind it does not surpass, so I guess in the end I'm a "cheap and easy" kind of guy after all. The Tabac just gives me what I want, and doesn't demand a whole lot in return.
"Any intelligent fool can make things bigger and more complex. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction." Albert Einstein