Antonio!!! Great to see you here too! I am Karl Rejman from Sword Forum. Funny, I just commented on a Hissatsu thread over there yesterday, and now I find you here!
Bravado: here's a very quick, and by no means complete story on the Hissatsu. I believe the name means "final blow". The knife is designed as a close quarters fighting tool. Originally it was designed to be carried in the centre of one's chest, so that you could access it with either hand. THis blade was amrketed to police tactical teams and military personnel. There is a wasp waisted handle to help secure your grip, and the lack of a guard is purposeful: no snagging on your other gear.
Originally a bunch of the Hissatsu blades (100 I believe is the number I remember seeing) were hand ground by Bob Engnath. The original was ATS-34 steel. Ancient Edge came on this forum (maybe others too, I don't know) and tried to advertise (hype?) this knife. A lot of questions were asked about things like the advertised "slashing index", and no answers were received. Some found the original sheath to be rickety, and the response was that most operators will duckt tape it securely to their gear anyways, so the knife nut community didn't care for that either. If you run a search on the hissatsu, you'll find that the general consensus was great design, cost was too high for most here, and the odd hype/sheath problems really got to folks.
I for one am glad that this design is once again available to everyone. The Hissatsu II has a MSRP of $99, so it will be accessable to many more people. The sheath looks to secure th e blade well while leaving the handle very much exposed, great for a quick grab. However, the sheath does look bulky, as CRKT sheaths can be. Pick up a Hisstsu and send it to Normark or some other kydex wizzards and you'll have a great set-up! I imagine a hissatsu in one of Robert H.'s shoulder rigs would be damned sweet.