Ravage can be a pain in the butt to reform to disc mode, you have to get the order of parts exactly right. Not hard, but more fiddly than any of the other disc formers.
My Ratbat had his wings overextended in the packaging, had to reclick into their correct position, thought I was going to snap his wings off.
I personally am not fussed on the Rumble/Frenzy mold, they look okay, but nothing more, but that is to be expected with what they had to work with to get alt mode to robot.
Colours are suitable and the metallic contrast in disc mode looks very nice. Ratbat is my favourite colour scheme, but I think that is a remnant of my love of Turbomaster pink.
All are very clever and well worth the $15 they are meant to cost, for the $12 I nabbed them for even better. Even if you don't have voyager Soundwave to eject themf rom, but collect the FoC toys/classics these will make nice display additions, but you'll likely keep one purely for the auto transform gimmick to play with.
Looking For: Wreckers Saga TPB Collection (with Requiem)