Ron -- yes, the MM5 is an experimental model. Some forecasters from NHC & TAFB have looked at the output from time to time, but it is not incorporated in the NHC track guidance suite and they do not use it in making operational forecasts. Part of that is the experimental nature, while another part of it is when it comes out -- for instance, the 12z run isn't finished until about 6pm ET/22z, largely because of computing power and needing the 12z GFS analysis to start the model off of (which itself isn't available until 16z or so). We've got some big plans for it, but those are in the long term (next 5 years) moreso than anything and will require more computer power than we have right now.