If you're gonna use it like a Martial Arts assassin, I think you should upgrade and put a shael into it to improve the speed eventually. Not very sure about this, a safer method would be to equip it on your assassin and test out the speed 1st without meddling with it. I'm guessing that Burst of Speed might be able to make up for the lack of speed on the weapon speed modifier.
If you're gonna use it for Blade Fury like a Furysin, then I'd suggest upgrading and socketing an Eth in it. A better choice would be Jah for Ignore Target's Defence a.k.a ITD but that's too expensive IMO. :P Blade Fury's speed is independent of the weapon's speed so it's ok to leave it as it is. However, Blade Fury works using your Attack Rating (though it doesn't display) so ITD will help you maintain a good chance of hitting; but since Jah is so expensive, an Eth might be a good choice. Use Cloak of Shadows before you engage monsters to lower their defence so that you can hit better. The other guides hosted in the Assassin forum will explain better.
Nice find! Definitely decent. Anyway, it's best to check out the other Assassin guides before you do anything with this weapon. I prolly won't want to use this as my Furysin weapon since there are better ones out there, take Stormlash for e.g. It's prolly more useful as a normal katar for raw damage.
That's an amazing claw. Blade Fury is the obvious choice, but with that Fool's mod you don't have to center your build around it. It'd be excellent on a Dtailer if you can work around the speed problem and get more +skills--for instance with a Bartuc's, or using Jade Talon/BoS. Or for the rare PhysDamage Tiger Striker or DCer. Decent for the Kicker/Trapper too, though the damage will go to waste except when you use Blade Fury.
That's all PvM, by the way. If you want more details about any of those builds, just ask.