I thought their karambit ring that sticks on the back of the Enduras and Delicas was pretty cool.
This fang is awesome! I will likely try one but it does look sharp, I will probably sand it down.
As for the peg wave like on the Pikal, I have not been at all able to understand why it has not appeared on more knives. To me it is hands down the best wave and also the least damaging on pockets to boot.
After my Emersons ate through a few pockets I was like "a small price to pay" but once every single pair of pants you own has pockets that are coming undone from the jeans it starts to get annoying. So now I just put my finger over the spine when drawing a waved knife and only wave sparingly.