I bought one recently. What a knife!
It came with a really bad edge. I don't mind putting in the hours sharpening, even touching up the grind, but this had a different grind on each side.
I did the unthinkable. I left a bad review on Heinnie Haynes. Within hours of writing it, they were in touch. They wanted me to send it back to them. They then sent it back to John Nowill Knives who put an absolutely amazing convex edge on it. Now it is perfect.
I'd been debating getting the knife for ages. I'd even put one guy off buying one, encouraging him to go with a smaller knife. For shame.
Now I've got one (and now it's sharp) I love it.
I'm going to take it out soon and do a review of it. A practical one. I think it aims to be the "one knife to rule them all". I know people don't like that concept, and nor do I in many ways, but if it's a survival knife, then it should be pretty good at everything. So I'm going to try and do everything with it. Not just heavy work too, but some fine work as well. Build a shelter, make some small & large traps, skin a rabbit, make some feathersticks, split some roots for cordage.
For sharpening you might want to check this out:
http://www.bushcraftuk.com/forum/showthread.php?t=110013&highlight=reprofiling
I started a thread requesting advice on reprofiling the knife, and I got a great answer.
Before I could get started on it though, Heinnie got in touch. They redefine good customer service. The speed with which everything got done was incredible & they even paid the postage.
Oh and you might like this video on the MOD Survival Knife:
http://www.youtube.com/watch?v=nJtiqYwigtY
What a legend! :theyareon