David Hewlett delivered a great performance in this episode, going through different stages of memory loss and other effects. The other actors performed well, too, and there was nice bonding moments all over. Here are some other thoughts:
Great to see Jeannie Miller again - I love the character.
Touching Sheppard/McKay scenes, with McKay banging on Sheppard's dood and the pier scene and McKay calling him Arthur at the end!
Brad Wright wrote this character development story, and there may be more of this type in the future Stargate Universe series.
Rodney saying that Dr. Nichols is so arrogant - that was funny!
Well, it's almost officially McKay/Keller!