[Coda]

The Twin Star dragons are solidly in the "good enough" camp. They don't suck. There are better monsters out there, of course, but if you have one and you don't have anything better you might as well use it.

Unfortunately they take freaking forever before they get to actually BE good enough.

Edit: Also noteworthy: You can undo ultimate evolutions, so if the Twin Star evolution's materials are unreasonable for you but one of the easier uvos is still useful, don't be afraid to take that one and switch it later.