Oh, I am not doubting that it is a better way to putt. I have been tinkering with it for almost a week now. I have been working on it everyday. It does take some getting used to as I am still trying to find the correct putter length, foot position and grip/stroke. But, I am a believer...
If you decide to "convert", I'll give you some unsolicited advice:
1. Watch the videos online from Randy Haag, Juan Elizondo, and David Cook (on the "Links of Utopia" website) There is a learning curve with face on, just like with anything else, and the instructional stuff from those guys is really, really good. Haag, for instance, puts great emphasis on the top hand staying still, which I believe MUCH more now than I did 16 months ago at the outset. Elizondo's advice of hitting a zillion putts from a putting trac on a carpet in your house and/or on a straight flat putt on a putting green is just critical; the whole thing is to learn to trust that the putter is simply going back and thru and that you are starting the putt on line. Once the habit of manipulating the putter head to square it back up is overcome, things really accelerate.
2. View it as a process and don't be afraid to tweak what you are doing. I changed my bottom hand grip after several months, and changed the length of the putter after over a year, both to great benefit. That's one piece of advice from Cook that is invaluable; enjoy the process.
3. Understand that you will NOT suddenly start making lots of 30 footers; that's just not the way putting works. The difference is twofold; you will find putts from 5' and in to be FAR easier, and you will find it FAR easier to avoid three putts. Your good days putting won't necessarily be much better than before, but your average day will be somewhat better and your BAD days will be FAR better. (If, by chance, you have the yips now, all bets are off; you will putt better from Day One!)
4. Go whole hog and make the change; don't go back and forth. Give face on a set period of time, and putt ONLY that way and then assess. Going back and forth will make you worse at both, IMO.
5. Cultivate an attitude of only caring about results and not in the least what other golfers think when they see you putting face on. Cook talks about this in his video briefly, but it's something to be ready for. I had an advantage in this, I think; I'm 64 and have spent my life in competitive athletics as a player and coach, plus I play a lot of competitive golf. And because of some things that have happened to my family, I'm long past giving a damn about what anybody thinks about what I'm doing in general, much less putting a golf ball. But I also realize that not everybody is in my situation, so not everybody is going to be comfortable with the reaction of others to putting face on. (This, btw, is where somebody like Dechambeau putting this way on TV would be helpful, I think.) And the flip side of this is that you'll get people who by the middle are really interested in talking about what you are doing because they see you putting better than they are!
Anyway, good luck with putting, whatever you decide to do.