I think in the long run, we will be using family matches. What I believe they are trying to do with the embryos is to get neutral organs which don't require a "match". It amounts to creating "organ factories" which is "sick". The problem remains that when they coax these embyos, they still use mice for "hosts" and that means the possibility of mixed species. That little item is hidden in some old text which I did find on the web at one time and I believe they were part of congressional hearings.
I'm glad you friend recovered. I don't know if the DNA is truly mixed afterwords or it's as Tasman said that it's not uncommon after therapy. If so, family donors would seem the ideal.
I have to disagree with your statement above though. An 'organ factory' is a crude name, but is not sick in itself. Growing a new organ for those in need is an ideal solution over the harvesting of body parts after death.
The methods and sources of those organs can indeed be sick, evidenced in the liberal wish to collect human children to do so. It stands though if a new organ is possible then an acceptable way should be found to do it.