ERC can make a very good bow. I think it is smart to back it either with rawhide, linen, silk or a wood backing. Try to get it as knot free as possible. I saw a cool all sapwood ERC ELB style bow a few years ago and was pleased with the cast from that 45# bow.
I have made a few ERC bows with mixed results...one exploded into a thousand pieces and was quite a rush and on a boo backed ERC bow I built both the top and bottom limbs folder softly about mid limb all at once. I would try ERC again if I had a nice piece. When successful ERC bows can be light in hand and very fast.