I can't afford HRs. So I just tested Buriza-do, Demon Machine and Insight Demon Crosbow, lol. TBH, they are pretty much same in terms of clearing speed in P2 game while the showing dmg is Buriza-do > Insight (it even has + critical strike) > Demon Machine. To me, the biggest difference among them is the graphic effect of explosive arrows, which is awesome!
Buriza-do is cool, but you need extremely higher IAS. My currect setup - 80 from Buriza-do, 20 from Hellwarden, 20 from Shael in Buriza-do, 30 from Horazon Gloves + Boots, 45 from Treachery.
Insight allows you to use Reaper or Lawbringer on merc, which is great in HC.
I think I'll respec and stick with Demon Machine as the red arrows are awesome, lol
You have enough ias from Buriza/Hellwardens itself for Mirrored Blades
But yeah either use Buriza or Demon Machine until you get a Mist (or not, its not a huge deal)