This topic will certainly lead to some tandy bashing from people that don't even have or tried one, but for my part - I own three of the punches.
So far, I'm quite happy. Even just 'factory' sharp they have cut cleanly and effortlessly. Of course I'm using a 3 lb maul, but basically
I've just let gravity do it's job and haven't had to use much pressure to cut. I haven't tried sharpening one yet, but I don't see a problem there.
On sale, they are a great alternative to their regular punches which don't cut very well at all. Cheers!