Well I sent the rasp on the way to David Rase today and I have to say I hate to see it go. I was anxious to use it on the curly ash stock that I am working on now. Before i touched it to the wood I checked it over and did notice that the radius is greater that the Nicholson that I have [USA]. The teeth are larger and spaced farther apart. The teeth on the edge [the ones that are facing 90 degrees away from the rest] are much larger.
While using it on the ash it did cut more aggressively. Sometimes when working it across the grain it almost grabbed the wood too much, causing the rasp to hang up. I think that is something that you could learn to avoid after using it awhile. When I use a rasp I nearly always have the handle in my right hand and lay my left hand on the rasp to help guide and control it. With this rasp it is really too sharp to do that because the teeth are so sharp it is really uncomfortable. Maybe I just needed to find a better way to use it, because I'm certainly not complaining about the teeth.
Now for the best part. This rasp just dosen't want to clog up. Even when using it across the grain of ash it clogged very little. What little did get in the teeth carded out very easily. I used my Nicholson #49 across the grain to compare and it really clogged the teeth, and was hard to card out.
If I was in the market for a #49 rasp I do think I would choose this rasp over the Nicholson. You just have to keep in mind that it more aggressive, therefore you have to switch to the #50 a little sooner.