Sean Cody will take good care of you. Very easy , thorough, and available for any questions. Got mine from him in January and have since done 5 ATF forms.
I've not done one, but if asked I always recommend Sean Cody. There are too many folks singing his praises for him not to be one of the best, if not the best, in Texas!
I actually wonder why more people don't go the NFA trust route, it is much easier that doing the paperwork as an individual. I will probably obtain an NFA firearm in the future, and a trust will be the way I will go...
Another +1 for Sean. I've heard of cheaper but I seriously doubt you will get the same level of service. Anytime I have a question and email him, I get a prompt response or phone call.