Arbitron is not so profitable like WesternPips Private 7. With p7 you can trade on most knowed brokers.
The big problem in arbitrage is that you nees to find a broker that pays the profits. For that must be regulated. Even they will block your account you can withdraw the profits because they are regulated.
I have also WP7 cracked and it is working verry good on mt4,mt5 and c trader also. I am using it with lmax fix api from wp. Is faster then any other feeder.
What i want to say is that Western Pips Arbitrage Eas are good and profitable with the right settings and broker but the price of them is verry expensive, thats why i buyed the cracked version