This episode was great because it was packed with emotion and had a finely-written plot. The whole storyline of Christian and his son got resolved (at least it looked like it) - He lost him, sadly. The scenes at the legal counseller's office and the moments before he was forced to hand over the baby to the biological father were heart-wrenching. Julia's declamation that Christian indeed had another child, Matt, wasn't all too shocking but now it's finally confirmed.
Loved the whole life/risk/responsability theme here. Sean's escapades were something I expected some time ago and all of those issues were rather nicely resolved in this episode.
All in all, a very moving addition to a show that is steadily going uphill.