Question cobalt on fretless?

[bass-slinger]

Can't wait to try out the cobalts, was wondering is there any idea what kind of wear these will put on a fretless fingerboard (vs. steel or nickel)?

 

[MattOfSweden]

Also very interested in how cobalts would perform on a fretless. Amazing I presume!
Only problem is my fretless is a sixstring, crossing my fingers for a sixstring set sometime in the future.