First transaction takes some time so don't panic.
They have high fees when converting PP > SLL > BTC so you need to be careful.
If you do small amounts, you may not be able to withdraw because the fees might take you below the minimum withdrawal amount. I'd suggest atleast $40 to be safe.
Other than that, they're safe. Though I'd advise against using them due to their fees. Use a card to buy from anywhere else (Coinbase, Circle, Blockchain).