FWIW, I agree with Mike on several counts: CB, that place in east Texas has a bit of info on their website that could be a little misleading -- one might reasonably infer that their pearl millet being prussic acid free is a unique trait, when in fact I'm almost certain that all strains of pearl millet are prussic free. For hay, I think prussic is not that big of a deal anyway since it dissipates over a relatively short period of time (unless my memory is playing tricks on me), unlike with nitrate poison. In addition pearl millet, sorghum alum, haygrazer, etc. all are subject to nitrate accumulation problems in drought situations and a few other scenarios as well.
I planted two fields with pearl millet and haygrazer side by side one year and found the millet to definitely be harder to get a stand in wet conditions. In a typical east Texas spring if you have very wet conditions you might be disappointed with the stand you get with millet.
The other problem, which I'm sure you realize, is the additional time required for drying after cutting, even with a conditioner/crimper (which is practically a necessity) as compared to bahia and bermuda. Also, we found that with wet conditions it seemed harder for an uncut field to dry out with millet and haygrazer and the stuff can get pretty rank, tall & stemmy if a wet spell sets in at the wrong time. Missed several chances to cut because we weren't dry enough and/or rain was predicted in a few days, while Jiggs bermuda guys just across the road easily made their hay. But the millet can produce a surprising amount of forage in pretty dry conditions.