I only used BTC with one of my broker (Exness ) but I was actually surprised how seamless was the experience. Pretty much instant deposit/withdrawals. Just have to make one operation more to change into USD or EUR for taking actual trades.
Here is screenshot of Bitcoin in the member area:
http://photoshar.in/exness-member-bitcoin
Here is screenshot of Bitcoin in the member area:
http://photoshar.in/exness-member-bitcoin