Another really solid issue, great character moments, good development of the plot, a few little extras and a huge misdirection.
Splitting the group has been used very well to give good chunky bits of characher development. The younger members of the team get a nice little scene in the danger room, we have a great Cyclops moment in Scott and Piotr's team up and some really great interplay between Storm and Wolverine. Vaughn again pulls in other mutants' views of the X-men which gives a bit more of the wider picture.
HUGE SPOILER WARNING
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DO NOT READ THIS BEFORE YOU READ THE ISSUE
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Seems that Ultimate Apocalypse is simply a figment of Sinister's twisted mind. The figure we saw him speaking to in the previous issue is a manequin, looking like a silly version of Apocalypse (which isn't too hard as Apocalypse does look a bit silly to begin with). The fact that Apocalypse didn't have proper speech bubbles now in retropsect works with the whole thing being in Sinister's mind. But this still raises the question as to who and what is Sinister (or Essex, as this is confirmed as being his real name this issue), and where he got his powers. I'm really looking forward to next issue and the arc following now, as I really want to know what's going on. I'm still not quite down with Sinister as a dumb stuttering thug but this is turning out to be really interesting. Cheers to Vaughn really messing with us.