This time we get to meet another version of Dorian. So there are still some versions of this model around. We now see a bit more of the difference between humans and androids. Until now I always asked myself what the great difference is between humans and androids as Dorian actually seems like a perfect human. As we see this other version we see that this all depends on the programming. They seem to have the same basic programming, which means that sometimes they act the same and say the same things, but a lot depends on the information they program into them and also the experiences they had. As with humans experiences build up some of the character of the androids and make the other Dorian different in the long run. I personally thought that it was morally questionable of Dorian to erase part of the other Dorian's memory. He was treating him like a machine in this respect, which you can just program and erase, and not like a self determined individual.
I also would have like to find out more about why they discontinued his model. We only got a few ideas but not the whole story. An episode with flashbacks to Dorian's past, when he was decommissioned would be very appreciated and interesting. When we see Dorian acting now, we really can't understand what the problem with these androids was.
The story still works mostly because of the interplay between the two main character, but I am still missing the depth regarding the future technologies and the ethically problems which they bring.
They kind of dodged the question in this episode why it is illegal to sell second hand artificial hearts. It makes actually no sense from a medical point of view, so they had to put in the extortion storyline to make us feel that this is a crime. A deeper story would have had some discussion about the power of the medical industry who can make more money when second hand organs are illegal, the power of companies have over which laws are passed and the gap between rich people who can afford to buy them and live longer and poorer people who are just left to die.