In fact, I was rather surprised that during the launch the developer had quoted only $200-$300+ for 3 bedroom, it seems rather low for a 3 bedroom. Now, they are being quoted maintenance fees more than double at $700+ for 3 bedroom.
I think it would affect many owners since these are monthly outgoing fees, but I don't think they would have much recourse on this as developers would probably have let them sign a fine print that fees are set to rise over time.

The secret of life is honesty and fair dealing. If you can fake that, you've got it made. - Groucho Marx (1890-1977)