We've actually seen a lot of interest in this approach - and yes, the BIG drawback is the ACP testing failure. BUT, if the numbers work, then it can be a viable solution for participants who have outside assets into the plan, and then converted to Roth so that future growth is tax FREE. But, it is a numbers game. We have one LARGE law firm doing this - where 1) all of the Associated make in excess of the HCE dollar limit; 2) NONE of the employer contributions go to Associates (i.e. - typical lawfirm 2 plans set-up with a Partner & Staff plan where employer contributions are made and a separate deferral plan for Associates only); and 3) the employer makes the "top paid group" election to limit the number of HCEs - resulting in all of the associates being NHCEs (despite making obscene amounts of money). The "Mega-Roth" feature is limited to use ONLY by NHCEs - which gives the Associates, and staff the opportunity to convert outside assets into tax FREE growth. Works for them. But it requires a situation like that to avoid the ACP issues.....