There's nothing to suggest that Cantara is shady or dishonest--in fact, its selection of books looks interesting. But I'm guessing that it has little capacity to market and distribute, and that sales and exposure will probably be tiny.
I also don't like the "small publisher with heart against the soulless Big Publishing Machine" rhetoric on the site. It's old, tired, and not especially accurate. For instance, this quote from Cantara's article, Writing in the New Publishing Paradigm: "Mint editions of John Grisham's first novel, which he paid to have published, are selling on eBay for upwards of three thousand dollars." Sigh. The notion that John Grisham self-published his first novel is among the most insidious and ineradicable of all anti-big-press myths. She also recycles a raft of other myths--that commercially published authors have to give back their advances if they don't earn out (they don't), and that all returned books are pulped (mass market paperbacks are pulped. Trade paperbacks and hardcovers are returned intact and can be re-sold).
IMO, you can be an interesting small press without all the posturing and breast-beating. In fact, it might leave you more time for things like marketing and distributing.
- Victoria