Obviously it worked for me because my NFA AK is in my hands with no legal problems.
Thats the heart of my concern with trusts. BATFE hasn't really looked at the substantive provisions of these trusts to see that they comply with relevant state laws regarding the formation of a valid trust prior to approval. As I now understand it, the new head of NFA is not as gun friendly as Ken Houchens was, and rumor has it he may now be investigating the terms in these trusts to see if there are any problems which could invalidate the trust. Note that NFA will no longer approva a transfer where only a simple certificate of trust has been submitted, but they now require the declarations so they can see the substantive terms. My guess is that they are going to be paying more attention to trusts and specific trust terms.
Whichever way you go, double & triple check EVERYTHING before the paperwork is finally sent off the the Feds.
100% agreement on that point, but if you don't have it drawn up by a lawyer in your state, I think at least an hour or so of lawyer time to review the trust terms should be considered part of your due dilligence and double check before sending it off.