SURPRISE DOUBLE FEATURE!
Seeing as I've managed to acquire a couple Siegekers, I thought I'd give my thoughts on the mold overall.

Honestly, I feel like the seeker mold may well actually be my dark horse of the Siege line. I was thoroughly underwhelmed by it at first, but it's so much better in hand. If Galaxy Prime didn't exist, it may well be my favourite Siege mold. (Granted, I haven't dipped
too thoroughly into Siege as a whole so take that as you will.)

Starscream is
probably the weaker of the two. Aside from having the wrong head, he doesn't wear the mold as well imo. He's
very grey, like, turn him around and he could blend in with a concrete wall.
I must have a later run of the figure, as he has the G1 Decepticon symbols, and his chest rarely pops off.

Thundercracker is great. The blue is fantastic, and really makes the mold pop. The details are clearer and even the battle damage looks nicer. Again, he had the wrong head but, I can fix that if I'm feeling brave.
AdDiTionAl SiEge tHouGhTsNow that Siege is coming to a close, I wanna kinda reflect on the line as a whole. Siege was pretty good. There was definitely a marked step up in quality from the latter half of Prime Wars. Plastic feels nicer, Figures feel denser, and there have been some fun little engineering tricks that have been worked in. Obviously, the TF team has a higher budget to play with now. If the concessions made in TR and POTP were made so we could get the current standard then I'm happy.
However, If I were to offer one criticism, then it would be this. Siege, I feel, lacked a unified aesthetic. And what I mean by that is that while Siege has some clear design cues, the way and amount they were actually used varies from figure to figure. For example, I feel like say, the Seekers, and like, Prowl, you can conceivably believe from different lines. I'm not surprised to hear that they're the battle damage for Earthrise, as I feel like they never fully committed to it any way. Kind of a shame too, as I feel like using the grittier, more battle worn look might have helped out some of the blander molds like Prowl, Red Alert or Megatron.
In any case, I'm glad Siege happened, and I'm interested in what Earthrise has in store.