Thanks for the info! The guy has only been living here for about a year (on a UK spousal visa), so he might JUST be able to meet the requirements for DCF filing. DH and I filed via DCF ourselves, and it took about a year, but we stretched it out to take that long (if we would have done things promptly, it probably would have only taken 8 months). I'll be sure to pass on all the information. I guess it boils down to whether or not they are willing to be separated for about a year.
Thanks again for your help, guys!