We've been feeding BMR since it was Cargill, have been as high as 80% forage. Pioneer has a BMR corn for next year, there is a WI company called Legacy that sells BMR, Byron seeds has several grasses that they claim are very digestible but I don't have any actual results from that yet.

Jungs HDS is more digestible than 'regular' corn but not as good as BMR and seems to yield well. Seed is much cheaper 'here'.

I try to counter BMR yield drag by planting a longer maturity variety, since there is no need for it to get ripe or dry down.