I dont trade the US with CFD's but i know many that do.
The positives are 10/1 margin,i only get 4/1 margin.Ability to short at any time,Nasdaq rules dont apply.
Another plus is that some of the US stocks on the hard to borrow list are short able with CFD's.Dont ask me more about that, but i remember being on GNI's trading floor and being surprised that their CFD clients could short things i couldn't.That one thing can be a big plus at times.Account opening size for CFD's is from about £2500.
Add in the margin and that gives you approx $45,000 each day to trade with.
Which by chance allows you to buy approx 1000 shares of the stock i mentioned in my last post (RRGB). A $2.21 move that i showed in that post would make you $2,210 profit which unless my maths is wrong is 49% return on your CFD starting capital in a trade that lasted approx 15mins.Of course it should be noted that any losses would be magnified the same way.