Well, now that I have swung this baby around some more, I can post a bit of my thoughts.
Here are
my stats:
my palm is about 3.5" across
5'10 170
(your results may very

)
I went out onto my balcony and tested it against a telephone book. Hard slaps on either side, hard chops to the book's spine.
the handle swells at the mid point and accommondates a two handed grip quite naturally.
Point of balance is approximately 6" from the guard.
One handed wielding is surprisingly good for a dedicated chopper, though once a swing is in motion, quick redirection requires at least some effort. Feels similiar to my medium weight 18" AK
Two handed feels much better and redirection is quicker. Keep in mind the Tarwar is ultimately a chopper and not a rapier. By no means however do I feel clumsy wielding it.
COP is difficult to determine, vibration doesn't seem to a problem and can only be felt very very slightly during moderate chopping. COP around the 18" mark from the guard. Didn't really test this.
The one and only issue that I found... The guard really digs into the web of my hand between forefinger and thumb. It looks like the buttcap of a khukuri. I sincerely recommend the use of thick leather gloves. The guard is important however as it keeps your hand from sliding down.
Overall, an amazing HI piece, possibly one of the best. The guard issue however needs to be addressed by either rounding it off or utilizing rounder, more tsuba like guards.
my 3 cents Cdn.
-D