I'm excited about the buff for the Imps with Sloane and the Quasar- I've long complained about the lack of good carrier support in the Imperial fleet, and the uselessness of the basic TIE. Shuttles started fixing this problem, this wave answers all my complaints.
I think that Sloane also does a great job of bringing the generic squadrons back into the game. Generic X-wings in particular get almost as much of a buff as TIEs here- their escort lets them protect your other aces from Sloaning, and in conjunction with flak they can really shred the squadrons of a player who pushes their TIEs out to go for defense token stripping before engaging and tying up those firing arcs.
The boarding parties are less exciting for me- as an imp who usually plays black-die heavy lists, they're nice because they give an option for a cheap but effective raider (those two upgrade slots can really add up when you're trying to build a good hitter, particularly given how fragile raiders are when their evades are useless at black range), but i need the OE unless I'm making a suicide run. On glads/torp boats there are better things for those spots, and/or the squadron/engineering doesn't add up.
That said, it's important to note that boarding parties go off when you flip a dial- so you can't, say, overload pulse and then boarding party away defense tokens with the same ship, or ACM damage cards on and then boarding engineer them faceup.