This episode in particular is a favourite of mine as it develops the infertility storyline of Chandler and Monica's. Having these people play this particular storyline was a brilliant idea - given Courtney Cox's well-known problems with her own fertility. In this episode, as well as others that follow, Courtney's performances are riveting, showing the real pain and frustration that she must have been feeling at the time. This, as well as TOW the Birth Mother, should have won Courtney Cox an Emmy/Golden Globe, as her performances are touching, real and powerful.
This storyline also allows a sensitive side of Chandler to show, giving him a chance to extend his range. Rather than always being sarcastic and cynical, he shows his real feelings. A new side to these already familiar characters.