Pro's
100% anonymous
Onsite wallet
Been paying for more than a year
Money forgotten in a onsite wallet is automatically sent back to the sending address after 3 days of inactivity
Con's
Markets sometimes turn off/on
Deposits need 1 confirmation
Low payout for btc/usd compared to forex pairs/gold/silver
Satoshi Option also runs a option exchange for btc/usd more similar to normal options instead of binary. I haven't personally tried that portion of the site yet though so no feedback.
Alternatively beastoption runs on professional binary option trading software which is pretty much the same as any usd/eur/gbp based binary broker. They also offer longer timeframe of 1m to 1h.
We've had a lot of discussions about onsite wallet, but we want to secure client's money as much as possible, and best way to do so is not to store client's money.
As many people have stated it's also the best way to prolong the bet by x amount of time. With a 60 second option even 1 second delay (never mine 50-100%) is enough to tip the scales from profit to loss. Which is why I only play where onsite wallets are available.
Hope this delays will be smaller after upcoming infrastructure update, and we're still discussing onsite wallets for hardcore players who wants no delay in bets processing. Thank you for your feedback.