My card was charged twice by Overstone Global Fund (overstoneglobalfund.com) on the same day. I had to dispute it with my bank. Overstone Global Fund (overstoneglobalfund.com) then froze my account and said I had a negative balance because of the chargeback. They created the problem and then punished me for it.
Pros: Good analytical tools|Customizable dashboard
Cons: Slow to add new assets