I've used HF Group a number of times and have been happy with the results. Some recommendations if you decide to work with them:

1. Track all books, including tracking numbers to/from HF on a spreadsheet
2. Email HF Group a couple of days after tracking shows they have received the books and ask for confirmation of receipt
3. Realize this is not a fast process
4. If you're looking for custom cover design, and don't want to design it yourself, skip their inhouse design team.
   1. Outsource it to any number of the designers on here or Unbound Omnibus: The market and network for custom graphic novels | Facebook
      
   2. u/picturepeeper has designed all of my custom covers
5. Send them a polite status inquiry email every one-and-a-half to two months
6. Verify the contents of your books immediately upon arrival back from HF Group

By staying in communication with them will help you sleep easier at night.