This episode has a fairy unoriginal and (at times) clichéd premise but I must confess to my enjoyment.
This is another dubious idea about an individual's consciousness being transferred, via technobabble, to a piece of technology and also a quite predictable possession story.
Fortunately there are enough good character moments to make it an enjoyable episode. The best aspects are the scenes involving Odo, Primmin, Sisko, Kadjada and Quark. Sisko giving both security officers a reprimand to make them work together is great.
I even enjoyed the infamous scenes involving Dr Bashir. In the opening scenes he is written as so beyond arrogant it is actually quite funny. However, it's his contribution to the plot resolution at the end that is so bad it's fantastic. I like Alexandra Siddig as an actor but he was really given a raw deal in the early episodes of the show.
Generally the episode has a mixed bag of performances. Terry Farrell is quite flat in some scenes, but to be fair to her she doesn't have much other than technobabble to deliver.