At the risk of reopening old wounds, I'd like to put forth the proposition that this version of Darth Vader is much more of a badass than the version of Darth Vader presented in Revenge of the Sith.
Which brings me to the following conversation between me, Meli, and a Borders checkout clerk, slightly edited for clarity:
Meli: [Indicating the light saber replica behind the counter.] How many of those do you actually sell?
Clerk: We actually just got a bunch more of them in.
Matt: [Mistakenly mistaking the color white for purple.] Looks like you have the Mace Windu one back there. Nice.
Meli: That's Darth Maul, honey.
Matt: No, look. It's purple.
Clerk: [Turns on the light saber replica, which begins glowing red.] I wish we had the Mace Windu light saber. That's the one I want. The most popular one is Luke's light saber. And the second most popular is Anakin's.
Matt: But wouldn't those be the same?
Clerk: No, no [you idiot], Anakin is Luke's father as a young man.
Matt: Yeah, I know, [I've seen the fucking movies,] but Obi Wan gives Luke Anakin's light saber, so the two should be the same.
Meli: No, honey, Luke makes his own light saber, remember?
Matt: After Darth Vader cuts his hand off, right?
Matt: So for the first two movies he has Anakin's light saber.
Meli: Yes, but his light saber is the one he makes.
Matt: Well, that's dumb.
Clerk: If you buy two Darth Maul light sabers you can stick them together.