I haven't been using one at all apart from a couple of bits of feather stick making and that earlier today. In fact, I've just finished burning them off. It carves well as long as you are only going in straight lines or shallow curves, due to the width of the blade. Saying that, the idea behind a Nessmuk style knife is that you chop with a hatchet and whittle with a small whittling knife such as a two blade pen knife. The large knife is a utility knife for use scraping shallows in the ground for a latrine or cutting staves for a shelter or similar.
The Jojo knife I have does good swinging cuts through reasonably sized green wood, and that was before I sharpened it right up. It wasn't blunt, it just wasn't razor sharp and I'm glad of that or else it would have done me more damage during the handling process! I will hopefully get out and play a bit more during the week with it, although I'll have to wrap it up to carry it as it doesn't have a sheath yet! So far though, it promises to be another great knife making the decision of which I take with me even more difficult!
- You know you can NEVER have too many knives! 
