>>6484147UniqueToys Provider - Really the only third party Octane (KFC's was announced years ago and still hasn't surfaced), suffers from the usual UniqueToys stretched-torso but actually a really good transformer
DX9 Chigurh - the most toy-friendly third party Astrotrain, but the worst looking one, aside from its shuttle mode. DX9's Gerwalt (their Blitzwing) comes with replacement parts for Chigurh's pelvis, which can't be bought on their own, but how much it needs them is unknown.
Toyworld Evila Star - looks a lot better than DX9's Astrotrain, but incredibly unfriendly as a toy, relies way too much on panels and is no fun to handle.
Machine Boy/Fancy Cell's Transportation Captain: Largely ignored by the 3P community, supposidely smaller than the other two Astrotrains and has no wheels, very similar to the G1-toy construction-wise.