I've never played the HB with the Darkstars in it. I have played DS'd basses, but not the HB. I have heard clips before, but it's not the same as playing it in person (duh).
I have played the Chi's in the HB. Very "solid body" sounding. What I mean is that there isn't that "hollow ring" associated with HB basses...the midrange complexity of the pups and the full 34'' scale combine for a very tight, powerful, punchy, sound.
I've also played the Bart loaded HB basses. These are not as punchy as the Chi's. Much more thud and less zing...though with the right eq and rounds it can get annoyingly bright. These give off more of a classic HB sound than the Chi's, but still clear and FULL sounding. Definitely low mid heavy, and these play supremely nicely with dirt pedals.
Again, I'd love to try the DS version, but, for me, the Barts are perfect in this bass. I'm sure if you asked 100 people, you'd get 33 for each and 1 for carrots