As melissa said, there's just no way of predicting outcomes.
My kids have the df508 + G551D combination. Both my older two had always been well and remain so, and there was a belief that some genetics were milder etc. We had our third child under that preconception (milder illness, basically no adverse effects), but he has not enjoyed the same level of health as the two older (although he is quite well also).
Hope that helps, and I realise that you want to hear something different, but there really is no way of knowing <img src="i/expressions/face-icon-small-smile.gif" border="0">
My kids have the df508 + G551D combination. Both my older two had always been well and remain so, and there was a belief that some genetics were milder etc. We had our third child under that preconception (milder illness, basically no adverse effects), but he has not enjoyed the same level of health as the two older (although he is quite well also).
Hope that helps, and I realise that you want to hear something different, but there really is no way of knowing <img src="i/expressions/face-icon-small-smile.gif" border="0">