Termination would never be considered for religious reasons, but no I have never been in that situation, and nor would I want to. I beleive that a child is human as soon as he/she is created, not just a 'fetus' so to ruin a human life imo would be like murder.
But again, it would be devastating to hear that your child will not have a 'normal' life. It just would not come to termination for us. But thats just MY opinion.