I had a problem with one product I purchased from 9mbi.  The file was corrupted.  I tried several times and several different methods to no avail.
9mbi worked with me and repacked the file in a different format and that did the trick. 

I have absolutely no hesitation about recommending 9mbi to anyone based on my own experience.  I received excellent service, an excellent product and a freebie.  I have no complaints.