chilifest question

Saw that Old Row is sponsoring “Iron Spikes” (a men’s org?) for Chilifest - but I know that typically that your frats each do their own individual themed builds, like i saw your SAE did a White House last year.
What’s Iron Spikes like, are they just as good as if you were to buy/go with a frat ? And are you only allowed into one team/frat build or can everyone just go to all of them, even if you didn’t buy with them?