theyre immensely leveraged. my broker gives me 20 to 1.
however you do have to be careful ad research. CFDS are based on spreads. meaning youre not buying or shorting at market prices but rather on a spread based incentive. If you do look for a broker look for one that offers market spreads and not one that are dictated by the broker.
With a direct market access broker you are trading exactly at bid/ask of the underlying. There are no spreads based on incentives or anything like that, what you're talking about are bucket shops that bet against you.
With blue chips I get something like 10/12 to 1 but never 20 to 1.