It's funny to see Reyes know a lot about the Brady Bunch, and funnier seeing Doggett's looks at Reyes for knowing such stuff. Doggett makes the illogical leap in this episode that turns out to be true. Doggett says that he's "finally getting the hang of this job". I think this line is intentional irony by Vince Gilligan to show that Doggett was just settling into his role as the X-Files was being canceled.
Scully's autopsies at time turn into the comic relief for the episodes. I like her "well-nourished" line, referring to the corpse. It's cool to see the agents using a high-tech web-cam to communicate with each other, instead of just a cell phone. I don't think they've used a web-cam since the Lone Gunmen used it once. Scully also gets high-tech with a headset recorder during her autopsy.
Michael Emmerson does a fine job as Oliver Martin. It's interesting to see that Doggett doesn't go through the roof like the other two victims, a sign that his power is decreasing(a good thing for Doggett).
I don't like to see Scully and Dr. Rietz's selfishness in wanting to study Oliver. Sure, it would give Scully proof, but no one wants to be a human lab rat. Even towards the end, you see the disappointment in Scully's eyes when they decide that it's best not to use Oliver as a human freak show.
Another problem I have with the episode is that once they discover that Oliver has this power, they just whisk him off to DC to study him, totally dropping the murder investigation. No mention of it. Sure, Oliver didn't have total control of his powers, but there are still two deaths two account for. The guy needs to be charged with manslaughter at least.
And finally, Bud Bundy. I loved seeing David Faustino in the role of Michael. He is a riot. It's too bad that he had to bite the dust. If he had stuck around the episode for a while longer, I might have given this a higher rating.
Overall, Sunshine days is a decent episode, but nothing extra-special. Vince Gilligan does a fine job writing and directing the final Monster of the Week episode which just about wraps up "the story of two lovely agents".