As an author who published at New Horizon Press -- and who personally knows several other NHP authors -- my advice is simple: run as fast and as far in the other directions as you can. From contract issues to royalty payments to editing to communication with the author, this house will only break your heart.
If you're smart, you'll pick up the phone (or email) and contact any NHP author you can find and ask for a personal reaction. To date, I have found NONE who have a positive thing to say about this house.
Avoid this house.