I'm really digging that Constructicon Devastator set, it looks really cool in how it achieves it's thing but the individual bots look quite cool too.
Vortex looks amazing, I dig his seemingly complete mish/mash of colours but his proportions look rather cool and it'll be great to have a Decepticon that looks to be about equal size to my Sideswipe!

I am absolutely sold on that Prime and Megatron 2 pack though! ; the pair look to have awesome Alt modes and even better Bot modes with both having excellent colour distribution and proportions. The added little figures and such are a nice addition but the 2 bots are what have me really looking forward to this set!