I like that it books into K, but I'd much rather have the $300 ECV. EQM and EUA make them worth much more to me. Of course this year, I've only managed an actual VDB on DL. My VDB on NW evaporated when the flight (oversold by 16) went mechanical and a bunch of pax had to be rebooked because of missed connections.
I agree that dollar-value ECVs are more useful. Of course, I got one of those too (a $200) from the same incident...

And the HNL-LAX RT portion of my ITO-HNL-LAX-MSP-EWR and back was paid for with a $400 DL ECV...