I have been working with GHR/HCTec since 2017.  I chose them because of the benefits they offered over several other travel agencies.  Their process is quick and painless.  There is a lot of paperwork, just like other companies, but they do tend to assign you to one person that you work with, so that makes it much easier.  I love the freedom of being able to work when and where I want.  I have worked several assignments with them and will continue to use them as my agency.