We did a half donor half DH sperm cycle with Warren last year, it is legal however they can't mix the embryos up. So you can't just put in whatever we knew we were using donor sperm embryos.
It was a great choice for us. DH needed one last try and wanted to be sure it was a sperm issue. We got 26 eggs. None of DH made it past day 3 and we got 4 blastocyst (our first ever) from the donor. My egg quality is great so this was amazing.
We are now starting again we got BFP from that fresh cycle but our son was stillborn. Sadly the other 3 were BFN. We will be doing a full cycle with the same donor this time so hopefully we will have a nice collection to transfer.